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No.	タイトル	出版年月	著者	誌名	巻号頁	掲載種別	DOI1	DOI2	URL1	出版者・発行元	概要
1	Diverse charge distributions in the triangular lattice superconductor kappa-(ET)2Cu[N(CN)2]I: infrared and Raman spectroscopic insights	2024/11/01	T. Yamamoto, Y. Nakamura, T. Naito, K. Konishi, M. Uruichi, K. Matsushita, and Y. Nakazawa.	日本物理学会欧文誌	93/ 12, 124701-1-124701-10	研究論文（学術雑誌）	10.7566/JPSJ.93.124701			日本物理学会
2	Nearly three-dimensional Dirac fermions in an organic crystalline material unveiled by electron spin resonance	2024/02/21	R. Oka, K. Ohara, N. Tajima, T. Shimada, T. Naito	Materials Advances	5/ 4, 1492-1501	研究論文（学術雑誌）	10.1039/D3MA00619K
3	Evidence for three-dimensional Dirac semimetal state in strongly correlated organic quasi-two-dimensional material	2023/12/15	田嶋尚也（東邦大）、川椙義高（東邦大）、森成隆夫（京都大）、岡竜平（愛大院理工（理）・学生）、自分、加藤礼三（理研）	J. Phys. Soc. Jpn	92/ 12, 123702 (4 pages)	研究論文（学術雑誌）	10.7566/JPSJ.92.123702	10.48550/arXiv.2302.05616
4	New Organic Crystalline Material Close to Nodal-Line Materials: α′-STF2IBr2	2023/11/20	Koki Funatsu, Ryuhei Oka, Naoya Tajima, Toshio Naito	Crystals	13/ 11, 1606 (13 pages)	研究論文（学術雑誌）	10.3390/cryst13111606			mdpi
5	A triad molecular conductor: simultaneous control of charge and molecular arrangements	2023/10/31	N. Kinoshita, A. Maruyama, T. Shirahata,* T. Naito, and Y. Misaki*	Chem. Commun.	59, 13575-13578	研究論文（学術雑誌）	10.1039/d3cc03198e
6	Ultrafast Pump–Probe Spectroscopy in Organic Dirac Electron Candidate α-(BETS)2I3	2023/10/10	S. Tsuchiya, M. Katsumi, R. Oka, T. Naito, Y. Toda	Condens. Matter	8, 88 (7 pages)	研究論文（学術雑誌）
7	Effects of Molecular Substitution in Organic Conductors α-(ET)2I3 and α-(STF)2I3 Studied by Polarized Femtosecond Spectroscopy	2023/09/15	S. Tsuchiya, N. Kanai, R. Oka, T. Naito, and Y. Toda	J. Phys. Soc. Jpn.	92/ 9, 094703 (7 pages)	研究論文（学術雑誌）
8	Band structure evolution during reversible interconversion between Dirac and standard fermions in organic charge-transfer salts	2023/06/09	R. Oka, K. Ohara, K. Konishi, I. Yamane, T. Shimada, and T. Naito	Magnetochemistry	9/ 6, 153 (19 pages)	研究論文（学術雑誌）	10.3390/magnetochemistry9060153
9	Synthesis of bicyclo[2.2.2]octadiene-fused 5,15-diazaporphyrin and 10-azacorrole with meso-imine bridges	2023/02/13	奥島鉄雄（理学部）、上田友貴（愛大院理工・学生）、井上真奈美（愛大院理工・学生）、森重樹（ADRES)、小原敬士（理学部）、高瀬雅祥（理学部）、宇野英満（理学部）、自分	Journal of Porphyrins and Phthalocyanines	27/ 1－4, 402-407	研究論文（学術雑誌）	10.1142/S1088424623500074			World Scientific
10	Synthesis of TSF Donors Substituted with the meso-dimethylethylenedithio Group: Structures and Conducting Properties of (meso-DM-BETS)2X (X− = PF6− and AsF6−)	2022/12/17	木下直哉（愛大院理工（工）・学生）、白旗崇（工学部）、自分、御崎洋二（工学部）	Bulletin of the Chemical Society of Japan	96/ 1, 35-41	研究論文（学術雑誌）	10.1246/bcsj.20220281
11	Coherent interlayer coupling in quasi-two-dimension Dirac fermions in alpha-(BEDT-TTF)2I3	2022/12/12	田嶋尚也（東邦大）、川椙義高（東邦大）、森成隆夫（京都大）、岡竜平（愛媛大院理工（理）・学生）、自分、加藤礼三（理研）	Journal of the Physical Society of Japan	92/ 1, 013702 (3 pages)	研究論文（学術雑誌）	10.7566/JPSJ.92.013702			日本物理学会
12	Conductivity of two-dimensional Dirac electrons close to merging in organic conductor alpha-STF2I3 at ambient pressure	2022/04/27	鈴村順三（名古屋大）、自分	J. Phys. Soc. Jpn.	91/ 6, 064701 (6 pages)	研究論文（学術雑誌）	10.7566/JPSJ.91.064701		URL	日本物理学会
13	Editorial for the special issue “Oranic Conductors”	2022/04/09	自分	Crystals		（MISC）その他記事	10.3390/cryst12040523
14	Narrow Zero Mode in Organic Massless Dirac Electron System alpha-(BEDT-TTF)2I3	2022/03/15	A. Mori, Y. Kawasugi, R. Doi, T. Naito, R. Kato, Y. Nishio, and N. Tajima	日本物理学会欧文誌	91, 045001 (2 pages)	研究論文（学術雑誌）	10.7566/JPSJ.91.045001		URL	日本物理学会
15	Theoretical model for novel electronic state in a Dirac electron system close to merging: an imaginary element between sulfur and selenium	2022/03/02	T. Naito & Y. Suzumura	Crystals	12/ 3, 346 (14 pages)	研究論文（学術雑誌）	10.3390/cryst12030346		URL	MDPI (Multidisciplinary Digital Publishing Institute)
16	Enhancements of Superconductivity and Insulating Electrical Resistivity under the Same Uniaxial Strain in a Molecular Conductor	2022/02/28	Yuichi Okii, Takashi Yamamoto*, Toshio Naito, Kensuke Konishi, Hiroki Akutsu, and Yasuhiro Nakazawa	J. Phys. Soc. Jpn.	91/ 3, 034707 (9 pages)	研究論文（学術雑誌）	10.7566/JPSJ.91.034707		URL	日本物理学会
17	Organic charge transfer complex at the boundary between superconductors and insulators: critical role of a marginal part of conduction pathways.	2021/12/15	T. Naito, H. Takeda, Y. Matsuzawa, M. Kurihara, A. Yamada, Y. Nakamura and T. Yamamoto.	Materials Advances	3, 1506-1511	研究論文（学術雑誌）	10.1039/D1MA00933H		URL	イギリス王立化学会
18	Universal relationship between sample dimensions and cooperative phenomena: Effects of fractal dimension on electronic properties of high-TC cuprate observed using electron spin resonance.	2021/12/14	内藤俊雄、福田喜章	Physical Chemistry Chemical Physics		研究論文（学術雑誌）	10.1039/D1CP04709D			イギリス王立化学会
19	Coexistence of interchanged and normal orbital levels in a molecular conductor consisting of a metal-dithiolene complex.	2021/11/15	T. Yamamoto, D. Hiraga, I. Arashi, K. Takasugi, T. Naito, M. Uruichi, F. Teshima, K. Tanaka, M. Nomura, R. Kato	日本物理学会誌（欧文誌）	90/ 11, 114704-1-114704-10	研究論文（学術雑誌）	10.7566/JPSJ.90.114704
20	Modern History of Organic Conductors: An Overview.	2021/07/20		Crystals	11/ 7, 838-1-838-53	研究論文（学術雑誌）	10.3390/cryst11070838
21	Lattice and charge fluctuation in a molecular superconductor.	2021/06/15	T. Yamamoto, T. Naito, M. Uruichi, H. Akutsu, Y. Nakazawa	日本物理学会誌（欧文誌）	90/ 6, 063708-1-063708-5	研究論文（学術雑誌）	10.7566/JPSJ.90.063708
22	Interview 太陽光を「蓄える」夢の物質に挑む : クラファンが支える新たな研究スキーム	2021/03	内藤俊雄	Optronics : 光技術コーディネートジャーナル	40/ 3, 97-102				URL	オプトロニクス社
23	Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems	2020/11/15	Ryotaro Kobara Shin Igarashi Yoshitaka Kawasugi Ryusei Doi Toshio Naito Masafumi Tamura Reizo Kato Yutaka Nishio Koji Kajita Naoya Tajima	Journal of the Physical Society of Japan	89/ 11, 113703-113703	研究論文（学術雑誌）	10.7566/jpsj.89.113703		URL	Physical Society of Japan
24	Direct observation of molecular orbitals using synchrotron x-ray diffraction	2020/11/01	Kitou S.	Crystals	10/ 11, 1-14		10.3390/cryst10110998		URL
25	Prototype Material for New Strategy of Photon Energy Storage	2020/09/25	Toshio Naito	Inorganics	8/ 10, 53-53	研究論文（学術雑誌）	10.3390/inorganics8100053		URL	MDPI AG	The smart utilization of photons is paid global attention from the viewpoint of renewable energy and information technology. However, it is still impossible to store photons as batteries and condensers do for electrons. All the present technologies utilize (the energy of) photons in situ, such as solar panels, or in spontaneous relaxation processes, such as photoluminescence. If we can store the energy of photons over an arbitrary period and utilize them on demand, not only we will make an innovative progress in energy management, but we will also be able to replace a part of electrons by photons in the information technology for more efficient performance. In this article, we review a prototype of such a material including the current status of related research as well as where we are heading for.
26	Steady-State Observation of Interacting Photochemical Species in Photoexcited Solid States	2020/09	K. Ichiryu T. Naito	日本化学会速報誌	49/ 9, 1038-1042	研究論文（学術雑誌）
27	Electronic Inhomogeneity in Organic Charge Transfer Salt kappa-(BEDT-TTF)2Cu[N(CN)2]I Probed by Polarized Femtosecond Spectroscopy	2020/06	Satoshi Tsuchiya Ryota Kuwae Takumi Kodama Yusuke Nakamura Megumi Kurihara Takashi Yamamoto Toshio Naito Yasunori Toda	日本物理学会欧文誌	89/ 6, 064712	研究論文（学術雑誌）
28	光のエネルギーを蓄えられる物質	2020/04	内藤俊雄	ケミカルエンジニヤリング = Chemical engineering	65/ 4, 235-240				URL	化学工業社
29	Band Structure and Physical Properties of alpha-STF2I3: Dirac Electrons in Disordered Conduction Sheets	2020/04	T. Naito R. Doi	Crystals	10/ 4, 270	研究論文（学術雑誌）
30	マテリアルニュース&トピックス光とその輻射熱を遮断できるマテリアル	2020/03	内藤俊雄	Material stage	19/ 12, 66-70				URL	技術情報協会
31	Electrical Resistivity under Uniaxial Pressures of β”-(bis-ethelenedithio-tetrathiafulvalene)4Pd(CN)4H2O	2020/03	Yuichi Okii Takashi Yamamoto Kensuke Konishi Toshio Naito	日本物理学会欧文誌	89/ 3, 034709	研究論文（学術雑誌）
32	Exotic Dirac Cones on the Band Structure of alpha-STF2I3 at Ambient Temperature and Pressure	2020/02	T. Naito R. Doi Y. Suzumura	日本物理学会欧文誌	89/ 2, 023701	研究論文（学術雑誌）
33	JST新技術説明会で発表	2019/06	内藤俊雄						URL		大学が保有する研究シーズを企業向けに講演する
34	A Possibly Highly Conducting State in an Optically Excited Molecular Crystal.	2019/06	T. Naito T. Karasudani R. Yamamoto M. Y. Zhang T. Yamamoto	Journal of Materials Chemistry C	7/ 30, 9175-9183	研究論文（学術雑誌）	10.1039/C9TC00491B				2019年7月9日現在 Webによる先行公開の段階（ページ等はまだ決まらず）
35	A molecular crystal with an unprecedentedly long-lived photoexcited state	2019	Toshio Naito Naoki Watanabe Yuuka Sakamoto Yuuko Miyaji Takashi Shirahata Yohji Misaki Shunsuke Kitou Hiroshi Sawa	Dalton Transactions	48/ 34, 12858-12866	研究論文（学術雑誌）	10.1039/c9dt02377a		URL	Royal Society of Chemistry (RSC)	<p>Gold(<sc>iii</sc>) atoms reversibly deviate from the molecular plane on receiving thermal and photon energy.</p>
36	Optical Control of Electrical Properties in Molecular Crystals; States of Matter beyond Thermodynamic Restrictions.	2018/12	Toshio Naito	Chemistry Letters	47/ 12, 1441-1452	研究論文（学術雑誌）
37	圧力下におけるα-ET₂I₃の熱的性質III	2018	高須康弘, 山田遼, 田嶋尚也, 梶田晃示, 西尾豊, 内藤俊雄, 加藤礼三	日本物理学会講演概要集	73/ 0, 1735-1735				URL	一般社団法人日本物理学会
38	圧力下におけるα-ET₂I₃の熱的性質IV	2018	高須康弘, 杉山敦, 田嶋尚也, 梶田晃示, 西尾豊, 内藤俊雄, 加藤礼三	日本物理学会講演概要集	73/ 0, 1215-1215				URL	一般社団法人日本物理学会
39	Charge and Lattice Fluctuations in Molecule-Based Spin Liquids	2017/10	Takashi Yamamoto Takashi Fujimoto Toshio Naito Yasuhiro Nakazawa Masafumi Tamura Kyuya Yakushi Yuka Ikemoto Taro Moriwaki Reizo Kato	SCIENTIFIC REPORTS	7, 12930	研究論文（学術雑誌）	10.1038/s41598-017-13118-4			NATURE PUBLISHING GROUP	Spin liquid (SL) systems have been the subject of much attention recently, as they have been theoretically predicted to not freeze, even at 0 K. Despite extensive searches being made for such a system, only a few candidates have been found. All of these candidates share geometrical frustrations that are based on triangular lattices. We applied vibrational spectroscopy to one of the candidates of a molecule-based SL system, and we compared its results against three antiferromagnetic compounds and four charge-ordered compounds. All of their structural motifs belong to triangular lattices. The C=C stretching modes in the SL state indicated that there were charge and lattice fluctuations. These fluctuations were suppressed but non-negligible in the AF compounds. This finding is potentially significant, as it indicates that a hidden lattice and charge fluctuation are the driving force of a geometrical frustration, which eventually leads to a SL state.
40	Dye-sensitized molecular charge transfer complexes; Magnetic and conduction properties in the photoexcited states of Ni(dmit)2 salts containing photosensitive dyes.	2017/05	Ryoma Yamamoto Takashi Yamamoto Keishi Ohara Toshio Naito	Magnetochemistry	3/ 2, 20-(16 pages)	研究論文（学術雑誌）
41	Development of a Control Method for Conduction and Magnetism in Molecular Crystals	2017/02	Toshio Naito	BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN	90/ 2, 89-136	研究論文（学術雑誌）	10.1246/bcsj.20160295			CHEMICAL SOC JAPAN	This study concerns development of a non-destructive method to control conduction and magnetism of molecular solids such as single crystals of charge-transfer complexes. The method is named "optical doping", where appropriate irradiation is utilized under ambient conditions. Owing to this feature, it can be applied to a wide range of substances while measuring the properties during the control. In addition, the method adds unique conduction and magnetic properties to common insulators. Unlike other doping methods, optical doping only affects the properties and/or structures of the irradiated part of a sample while leaving the rest of the sample unchanged. There are two patterns in the optical doping. Irreversible optical doping produces junction-structures on the single molecular crystals, which exhibit characteristic behavior of semiconductor devices such as diodes and varistors. Reversible optical doping produces "giant photoconductors" and "photomagnetic conductors" by realizing unprecedented metallic photoconduction. In the latter case, localized spins are also excited to produce a Kondo system, where carriers and localized spins interact with each other. Not only the control of conduction and magnetism, the optical doping has realized the observation of physical properties in molecular crystals hardly observed under any thermodynamic condition.
42	α-ET₂I₃の熱的性質	2017	高須康弘, 大嶋一樹, 田嶋尚也, 梶田晃示, 西尾豊, 内藤俊雄, 加藤礼三	日本物理学会講演概要集	72/ 0, 1797-1797				URL	一般社団法人日本物理学会	<p>α-(BEDT-TTF)_2I_3は無加圧下で135 Kで電荷秩序を伴う金属-絶縁体転移を起こし、圧力印加により転移温度が低温側へシフトし、15 kbar 以上ではDirac電子系を形成する。しかし未だDirac電子系の電子比熱の定量的評価はされていない。本研究では加圧に伴って、通常の電子系からDirac電子系へどのように移行していくのかを明らかにするため、転移に伴う自由電子系の消滅により電子比熱の定量的評価を行うとともに低温の電子比熱の温度依存性を測定する。</p>
43	β´´-型ET塩の一軸性圧縮実験III	2017	沖井優一, 山本貴, 内藤俊雄, 圷広樹, 中澤康浩	日本物理学会講演概要集	72/ 0, 1861-1861				URL	一般社団法人日本物理学会	<p>β''-型ET塩の超伝導転移は電荷揺らぎ機構の観点から注目されている。我々は、最近接相互作用の影響を考察するため、静水圧超伝導体と常圧超伝導体に一軸圧を印加した。常圧超伝導体の二次元面の各主軸方向に印加したところ、絶縁体的挙動が促進されると同時に鋭い超伝導転移が観測された。電荷整列を引き起こす最近接相互作用の重要性が再認識できた。</p>
44	圧力下におけるα-ET₂I₃の熱的性質	2017	高須康弘, 山田遼, 田嶋尚也, 梶田晃示, 西尾豊, 内藤俊雄, 加藤礼三	日本物理学会講演概要集	72/ 0, 1485-1485				URL	一般社団法人日本物理学会
45	Critical current density of superconductors with different fractal dimensions.	2016/11	T. Naito H. Yamamoto K. Konishi K. Kubo T. Nakamura H. Mayama	Adv. Mater. Sci.	1/ 1, 15-21
46	Direct Control of Spin Distribution and Anisotropy in Cu-Dithiolene Complex Anions by Light.	2016/03	Hiroki Noma Keishi Ohara Toshio Naito	Inorganics	4/ 2, 7 (21 pages)
47	20pAS-6 α-(BEDT-TTF)_2I_3, α-(BETS)_2I_3, α-(BEDT-STF)_2I_3の熱的性質	2016	大嶋一樹, 木田悠斗, 田嶋尚也, 梶田晃示, 西尾豊, 内藤俊雄, 加藤礼三	日本物理学会講演概要集	71/ 0				URL	一般社団法人日本物理学会
48	α-D₂I₃ (D = BEDT-TTF, BEDT-TSF, BEDT-STF) の熱的性質	2016	大嶋一樹, 木田悠斗, 田嶋尚也, 梶田晃示, 西尾豊, 内藤俊雄, 加藤礼三	日本物理学会講演概要集	71/ 0, 1600-1600				URL	一般社団法人日本物理学会	<p>α-(BEDT-TTF)_2_I_3_は高圧下でディラック電子系を有する物質であり、この系に最も特徴的な線形のバンド構造を熱的実験で明らかにできる唯一の物質であるが、未だに熱的実験の定量的なデータが少ない。本研究では測定方法を改良して比熱測定を行い、表題物質の電子構造を明らかにすることが目的である。予備実験では無加圧下でBEDT-TTF, BEDT-TSF, BEDT-STFの比熱を測定し熱的特性を観測することに成功した。講演では比熱の測定結果に加え、表題物質の熱伝導度も示す予定である。</p>
49	κ-(ET)₂Cu[N(CN)₂]Iにおけるポンプ－プローブ時間分解分光測定	2016	土屋聡児玉匠中村祐介山本貴内藤俊雄戸田泰則	日本物理学会講演概要集	71/ 0					一般社団法人日本物理学会	<p>有機超伝導体{\kappa}-(ET)2Cu[N(CN)2]X（X=Cl,Br,I）はアニオンの原子Xを化学置換することで、結晶構造を変化させることなく、電子物性に対する圧力効果を系統的に調査できる系として注目さている。しかし、X=Iの試料に関して作製の困難さから測定例が非常に少なく、その物性は未解明の部分が多い。今回X=Iの試料に対してフェムト秒光パルスを用いた時間分解分光行い、非平衡準粒子緩和ダイナミクスを調べた。</p>
50	光照射下の銅(II)ジチオレン錯体塩の磁性・伝導性	2015/11/07	野間博貴小原敬士山本貴内藤俊雄	日本化学会中国四国支部大会講演要旨集	2015				URL
51	高い光伝導を示すNMQ[Ni(dmit)₂]の伝導機構に関する研究	2015/03/11	長山直樹小原敬士山本貴内藤俊雄	日本化学会講演予稿集	95th/ 2				URL
52	光照射によって不対電子の局在性が変わる銅(II)ジチオレン錯体塩の電気・磁気挙動	2015/03/11	野間博貴小原敬士山本貴内藤俊雄	日本化学会講演予稿集	95th/ 2				URL
53	16aAH-10 有機導体α-(BEDT-TTF)_2I_3の熱的性質	2015	大嶋一樹, 田嶋尚也, 梶田晃示, 西尾豊, 内藤俊雄, 加藤礼三	日本物理学会講演概要集	70/ 0				URL	一般社団法人日本物理学会
54	18pAH-5 圧力下超伝導体β-ET塩およびβ"-ET塩の電荷整列状態に対する異方的圧力効果	2015	山本貴, 沖井優一, 内藤俊雄, 大西功二, 中澤康浩	日本物理学会講演概要集	70/ 0				URL	一般社団法人日本物理学会
55	Activation Energy for Photoconduction in Molecular Crystals.	2015	N. Nagayama T. Yamamoto T. Naito	CheM	2015, 74-80
56	Giant Photoconductivity in NMQ[Ni(dmit)(2)]	2014/08	Toshio Naito Tomoaki Karasudani Naoki Nagayama Keishi Ohara Kensuke Konishi Shigeki Mori Takahiro Takano Yukihiro Takahashi Tamotsu Inabe Shota Kinose Sadafumi Nishihara Katsuya Inoue	EUROPEAN JOURNAL OF INORGANIC CHEMISTRY	2014/ 24, 4000-4009	研究論文（学術雑誌）	10.1002/ejic.201402035			WILEY-V C H VERLAG GMBH	The simple molecular salt NMQ[Ni(dmit)(2)] (NMQ = N-methylquinolinium, dmit = 1,3-dithiol-2-thione-4,5-dithiolate) functions as a diamagnetic insulator with an activation energy E-a(dark) of 0.20 eV. However, at 300 K, it exhibits ca. 40 times higher conductivity (sigma(UV)) under UV irradiation [(375 +/- 5) nm, 15.7 mW cm(-2)] than it does under dark conditions (sigma(dark)). The ratio sigma(UV)/sigma(dark) rapidly increases with decreasing temperature and reaches ca. 880 at 200 K. From the temperature dependence of sigma(UV), the activation energy under irradiation E-a(UV) is 0.12 eV. These observations cannot be explained as the result of sample heating during UV irradiation. Rather, the X-ray photoelectron spectra of the sulfur and nickel atoms, the calculated band structure, and the UV/Vis spectra of the salt can all be explained consistently as follows: charge transfer between the Ni(dmit)(2) moieties upon exposure to 375 nm UV light induces melting of the charge-ordered state and produces the unusually large photoconductivity of NMQ[Ni(dmit)(2)].
57	[Cu(dmit)(2)](2-) Building Block for Molecular Conductors and Magnets with Photocontrollable Spin Distribution	2014/08	Hiroki Noma Keishi Ohara Toshio Naito	CHEMISTRY LETTERS	43/ 8, 1230-1232	研究論文（学術雑誌）	10.1246/cl.140318			CHEMICAL SOC JAPAN	[Cu(dmit)(2)](2-) formally consists of a magnetic Cu2+ ion (S = 1/2) and closed-shell pi-conjugated dmit(2-) ligands. However, it has been determined by electron spin resonance and molecular orbital calculations that the majority (91-100%) of the spin delocalizes over the ligands in the ground state, while the spin significantly (40-90%) localizes on Cu under UV irradiation. Considering the results of X-ray structural analyses under UV irradiation, the spin distribution varies depending on the wavelengths irradiated and retaining the square-planar coordination geometries.
58	Capacitor-like behavior of molecular crystal β-DiCC[Ni(dmit)2].	2014/07	T. Saiki S. Mori K. Ohara T. Naito	Chem. Lett.	43/ 7, 1119-1121	研究論文（学術雑誌）	10.1246/cl.140309			CHEMICAL SOC JAPAN	beta-DiCC[Ni(dmit)(2)] (dmit: 1,3-dithiole-2-thione-4,5-dithiolato and DiCC: 3,3'-dihexyloxacarbocyanine) is a charge-transfer salt with redox activity. When voltages are applied, it brings about a reversible, hysteretic, solid-state-electrolytic reaction exhibiting a capacitor-like electric response. Based on the electron spin resonance spectra, the resistivity behavior, and the tight-binding band calculation, it is indicated that one can finely and reversibly control the redox equilibrium between DiCC(+) and [Ni(dmit)(2)](-) molecules by applying voltages.
59	Ni‐dmit錯体の特異的に大きな光伝導性	2014/03/12	内藤俊雄烏谷知明長山直樹小原敬士小西健介森重樹高野崇廣高橋幸裕稲辺保木瀬翔太西原禎文井上克也	日本化学会講演予稿集	94th/ 2				URL
60	29pCL-9 STMによる有機結晶の結晶構造と表面再構成の相関(29pCL 多層ディラック電子系α-(ET)_2I_3,領域7(分子性固体))	2014	坂本浩一, 森英一, 生井圭一郎, 田原弘之, 有元秀行, 溝口憲治, 矢持秀起, 平松孝章, 内藤俊雄	日本物理学会講演概要集	69/ 0				URL	一般社団法人日本物理学会
61	29pCL-15 有機導体α-(BEDT-TSeF)_2I_3単結晶の^<13>C-NMR II(29pCL 多層ディラック電子系α-(ET)_2I_3,領域7(分子性固体))	2014	島本匠弥, 荒井健一, 鷹野芳樹, 開康一, 高橋利宏, 田嶋尚也, 加藤礼三, 内藤俊雄	日本物理学会講演概要集	69/ 0				URL	一般社団法人日本物理学会
62	Thermoelectric power of multilayered massless Dirac fermion system α-(BEDT-TTF)2I3 ーChrage ordering and zero-gap statesー	2014	R. Kitamura N. Tajima K. Kajita R. Kato M. Tamura T. Naito Y. Nishio	JPS Conference Proceedings	1, 012097(4 pages)
63	Magnetic ordering of spin systems having fractal dimensions Experimental study	2013/10	T. Naito H. Yamamoto K. Okuda K. Konishi H. Mayama D. Yamaguchi S. Koizumi K. Kubo T. Nakamura	EUROPEAN PHYSICAL JOURNAL B	86/ 10, 410 (9 pages)	研究論文（学術雑誌）	10.1140/epjb/e2013-40353-3			SPRINGER	It is well-known that cooperative properties such as magnetic ordering can depend on the samples' dimensions (Ds) in a qualitative way. However, there have been no samples with well-defined non-integer Ds. The dimension of a given sample has been always discussed on the anisotropy of the electronic/crystal/magnetic structures, which has no definition suitable for quantitative discussion on dimensions vs. properties. On the other hand a particular type of porous samples, i.e. fractal bodies, can have well-defined non-integer Ds dependent exclusively on the geometrical feature of structures, and physical properties of such materials remains unexplored. This paper reports on magnetic ordering in samples covering 2.5 <= D <= 3, in addition to a way of precise control of the fractal dimensions of given samples simply by wax (alkylketene dimer). The results show that the magnetic ordering temperatures, i.e. Neel temperatures (T(N)s), of CoO depend on D, and rapidly enhance immediately below D = 3. This means that one can control or enhance the critical temperature simply by tuning D with keeping the remaining magnetic properties unchanged.
64	Metamagnetic Transition and Its Related Magnetocapacitance Effect in Phthalocyanine-Molecular Conductor Exhibiting Giant Magnetoresistance	2013/09	Noriaki Hanasaki Takuma Tateishi Hiroyuki Tajima Motoi Kimata Masashi Tokunaga Masaki Matsuda Akinori Kanda Hiroshi Murakawa Toshio Naito Tamotsu Inabe	JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN	82/ 9, 094713 (14 pages)	研究論文（学術雑誌）	10.7566/JPSJ.82.094713			PHYSICAL SOC JAPAN	The magnetization and transport properties of iron-phthalocyanine molecular conductors are investigated under pulsed high magnetic fields up to 55 T. The metamagnetic transition is observed at approximately 14 T, where conductivity is enhanced. Below this transition, the tan delta (= epsilon ''/epsilon') in the dielectric constants shows a monotonic decrease as the magnetic field strength increases, indicating that the magnetic field stabilizes the charge order. On the verge of this transition, the dielectric constants show a hysteresis below the weak-ferromagnetic transition temperature (6 K), suggesting that the pi-electron charge order contributes to the weak ferromagnetism.
65	大学発産業界行シーズ(研究成果)探訪(vol.119)未来型電子デバイスの"光合成"を目指して	2013/08	内藤俊雄	愛媛ジャーナル	27/ 2, 79-83				URL	愛媛ジャーナル
66	25pDJ-9 二量体化したユニットをもつ分子性導体における動的電荷不均一性の研究(電荷秩序,領域7(分子性個体・有機導体))	2013	山本貴薬師久弥田村雅史藤本尚史内藤俊雄大西功二松下幸一郎中澤康浩加藤礼三池本夕佳森脇太郎	日本物理学会講演概要集	68/ 0					一般社団法人日本物理学会
67	Reversible and simultaneous control of conduction and magnetism in organic materials by UV irradiation.	2013	T. Naito	J. Material. Sci. Eng.	82, 034719 (14 pages)		10.7566/JPSJ.82.034719
68	Simultaneous Control of Carriers and Localized Spins with Light in Organic Materials	2012/12	Toshio Naito Tomoaki Karasudani Keishi Ohara Takahiro Takano Yukihiro Takahashi Tamotsu Inabe Ko Furukawa Toshikazu Nakamura	ADVANCED MATERIALS	24/ 46, 6153-6157	研究論文（学術雑誌）	10.1002/adma.201203153			WILEY-V C H VERLAG GMBH	An organic insulating crystal reversibly becomes a magnetic conductor under UV irradiation. The rapid and qualitative change in the physical properties is wavelength selective and explained by charge transfer between donor and photochemically active acceptor molecules. The photochemical redox reaction in the crystal produces a partially filled band and localized spins simultaneously.
69	Molecular Photoconductor with Simultaneously Photocontrollable Localized Spins	2012/11	Toshio Naito Tomoaki Karasudani Shigeki Mori Keishi Ohara Kensuke Konishi Takahiro Takano Yukihiro Takahashi Tamotsu Inabe Sadafumi Nishihara Katsuya Inoue	JOURNAL OF THE AMERICAN CHEMICAL SOCIETY	134/ 45, 18656-18666	研究論文（学術雑誌）	10.1021/ja306260b			AMER CHEMICAL SOC	UV irradiation reversibly switches a new insulating and nonmagnetic molecular crystal, BPY[Ni(dmit)(2)](2) (BPY = N,N'-ethylene-2,2'-bipyridinium; Ni(dmit)(2) = bis(1,3-dithiole-2-thione-4,5-dithiolato)nickelate(III)), into a magnetic conductor. This is possible because the bipyridyl derivative cations (BPY2+) trigger a photochemical redox reaction in the crystal to produce a change of similar to 10% in the filling of the Ni(dmit)(2) valence band, leaving localized spins on the BPY themselves. In the dark, almost all of the BPY molecules are closed shell cations, and most of the Ni(dmit)(2). radical anions form spin singlet pairs; thus, this material is a diamagnetic semiconductor. Under UV irradiation, a photocurrent is observed, which enhances the conductivity by 1 order of magnitude Electron-spin resonance. measurements indicate that the 'UV:. irradiation reversibly generates. carriers and localized spins on the Ni(dmit)(2). and the BPY, respectively: This high photoconductivity can be explained by charge transfer (CT) transitions between Ni(dmit)(2) and BPY in the UV region. In other words, the photoconduction and "photomagnetism" can be described as reversible optical control of the electronic states between an ionic salt (BPY2+/[Ni(dmit)(2)](-), nonmagnetic insulator) and a CT complex (BPY2(1-delta)+/[Ni(dmit)(2)]((1-delta)-) (delta approximate to 0.1), magnetic conductor) in the solid state.
70	Metallic One-Dimensional Conductors Composed of Axially Ligated (Phthalocyanato)Co-III with Supramolecular Cations of A(EtOH)(4) (A = Na and K)	2012/09	Yasuhiro Tanaka Manabu Ishikawa Naoko Watanabe Yukihiro Takahashi Toshio Naito Tamotsu Inabe	CRYSTALS	2/ 3, 946-957	研究論文（学術雑誌）	10.3390/cryst2030946			MDPI AG	Electrolysis of Na and K salts of the anion dicyano(phthalocyaninato) cobalt(III) (Co(Pc)(CN)(2)) in ethanol yields one-dimensional partially oxidized salts of A[Co(Pc)(CN)(2)](2)center dot 4(EtOH) (A = Na and K). The cationic component is the supramolecular cation [A(EtOH)(4)](+), which forms hydrogen bonds with the CN ligands of the Co(Pc)(CN)(2) units. The crystal shows metallic conductivity, in contrast to the thermally activated conductivity observed in the isomorphous tetraphenylphosphonium (TPP) salt of TPP[Co(Pc)(CN)(2)](2). Since the pi-pi interactions in these isomorphous crystals are nearly the same, the distinctive behavior of the Na and K salts may be attributed to the difference in the degree of charge disproportionation in these crystals.
71	Carrier doping to the organic Mott insulator by conjugating with tetrathiafulvalene	2012/09	Y. Takahashi Y. Nakagawa K. Hayakawa T. Inabe T. Naito	APPLIED PHYSICS LETTERS	101/ 10, 103303 (4 pages)-957	研究論文（学術雑誌）	10.1063/1.4750066			AMER INST PHYSICS	The electrical conductivity of the organic Mott insulator ET-F(2)TCNQ (ET = bis(ethylenedithio) tetrathiafulvalene, F(2)TCNQ = 2,5-difluoro-7,7,8,8-tetracyanoquinodimethane) crystal was found to be enhanced by conjugation with a tetrathiafulvalene (TTF) single crystal on its surface; surface sheet resistance decreased from 5 x 10(5) to 2 x 10(3) Omega/sq. The mechanism of this decrement was investigated through optical and atomic force microscopy measurements at the interface. When TTF was conjugated to the ET-F(2)TCNQ crystal, electron injection from TTF and complex formation between TTF and F(2)TCNQ occurred. Neutral ET molecules were consequently generated at the interface, and this charge doping broke the Mott insulating state. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4750066]
72	XANES Analysis of phthalocyanine molecular conductor	2012/04/14	Kei Takahashi Takehisa Konishi Takashi Fujikawa Noriaki Hanasaki Naomi Kawamura Masaichiro Mizumaki Masaki Matsuda C. Yu Derrick Ethelbhert Toshio Naito Tamotsu Inabe Hiroyuki Tajima	e-Journal of Surface Science and Nanotechnology	10, 92-96	研究論文（国際会議プロシーディングス）	10.1380/ejssnt.2012.92				The dicyano(phthalocyaninato)iron molecular conductor shows the Giant Magnetoresistance (GMR) effect. In order to investigate the effect of the molecular structure and charge on the X-ray absorption in the Fe(Pc)(CN)2 molecule, we measured the Fe K-edge X-ray Absorption Near Edge Structure (XANES) spectra in the TPP[Fe(Pc)L 2] 2 (L=CN, Br, and Cl), DMDP[Fe(Pc)(CN) 2], and [(n-C 2H 2) 4N][Fe(Pc)(CN) 2]. In 7134-7152 eV, we found the clear difference in the XANES spectra between these Fe(Pc)(CN) 2compounds. Our multiple scattering calculations indicate that the local structure of the iron and CN ligand, which tends to be changed by the nominal charge in the Pc ring, causes the spectral change.© 2012 The Surface Science Society of Japan.
73	光応答性が期待される分子性伝導体の構造と物性	2012/03/09	内藤俊雄烏谷知明森重樹小原敬士小西健介高野崇廣高橋幸裕稲辺保	日本化学会講演予稿集	92nd/ 2				URL
74	Structural Characteristics in a Stable Metallic ET Salt with Unusually High Oxidation State (ET: Bis(ethylenedithio)tetrathiafulvalene)	2012/03	Hiromi Minemawari Judy Fe F. Jose Yukihiro Takahashi Toshio Naito Tamotsu Inabe	BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN	85/ 3, 335-340	研究論文（学術雑誌）	10.1246/bcsj.20110253			CHEMICAL SOC JAPAN	Electrolysis of ET in a mixed solvent of methanol/CHCl3 with bromide yielded (ET)(3)(Br-3)(5), in which an unusually high formal charge of ET5/3+ is achieved. ET forms a two-dimensional conducting sheet incorporating Br-3(-). Despite the high formal charge of the ET cations, the strong electrostatic attractions between the ET cations and Br-3(-) support aggregation of the ET cations, allowing sufficient pi-pi overlap for delocalization of the pi-electrons. The crystal shows stable metallic behavior down to low temperatures, being consistent with the metallic band structure with two-dimensional Fermi surfaces and Pauli-like paramagnetism down to low temperatures. The lack of any indication of instability in the metallic phase due to correlation effects is considered to result from an ionic-crystal-like structure, in which the lattice is more resistant toward lattice deformation and/or shrinkage than in typical partially oxidized salts with low formal charges.
75	Charge Distribution in the Surface BEDT-TTF Layer of α-(BEDT-TTF) 2I3 at Room Temperature with Scanning Tunneling Microscopy.	2012/01	E. Mori H. Usui H. Sakamoto K. Mizoguchi T. Naito	J. Phys. Soc. Jpn	81/ 1, 014707 (7 pages)-96	研究論文（学術雑誌）	10.1143/JPSJ.81.014707			PHYSICAL SOC JAPAN	The charge distribution in the surface BEDT-TTF layer of the alpha-(BEDT-TTF)(2)I-3 crystal with the charge disproportionation state at room temperature was studied in detail by a scanning tunneling microscope (STM), where BEDT-TTF (abbreviated as ET) is bis(ethylenedithio) tetrathiafulvalene. The obtained molecular charge distribution in the surface ET layer suggests that the electronic states of the surface ET layer at room temperature is the charge-ordered state, stable below 135K in bulk crystals, rather than the charge disproportionation state above 135 K. The most probable mechanism underlying this remarkable finding is the particular freedom to the surface ET layer. The missing of the I-3 layer partially removes the structural constraint of the steric interaction between the thermally vibrating ethylene groups and the neighboring two I-3 layers. This mechanism would have something in common with the layered ET complexes.
76	What Happens at the Interface between TTF and TCNQ Crystals (TTF = Tetrathiafulvalene and TCNQ=7,7,8,8-Tetracyanoquinodimethane)?	2012/01	Yukihiro Takahashi Kei Hayakawa Toshio Naito Tamotsu Inabe	JOURNAL OF PHYSICAL CHEMISTRY C	116/ 1, 700-703	研究論文（学術雑誌）	10.1021/jp2074368			AMER CHEMICAL SOC	The interface between tetrathiafulvalene (TTF) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) crystals was prepared by treating a TCNQ single crystal surface with TTF powder. Optical measurements and atomic force microscopy (AFM) observation of the interface indicated that not only are TTF-TCNQ nanocrystals formed at the interface, but also direct charge injection from TTF powder to the TCNQ single crystal surface may be responsible for the high conductivity of the interface.
77	Carrier Dynamics in a Series of Organic Magnetic Superconductors	2012/01	Toshio Naito Saori Matsuo Tamotsu Inabe Yasunori Toda	JOURNAL OF PHYSICAL CHEMISTRY C	116/ 3, 2588-2593	研究論文（学術雑誌）	10.1021/jp210966u			AMER CHEMICAL SOC	Understanding how electrons behave, i.e., carrier dynamics, in superconductors is indispensable for understanding the mechanism of superconductivity. Recently we have reported the carrier dynamics of kappa- and lambda-(BETS)(2)MCl4 (BETS = bis(ethylenedithio)tetraselenafulvalene, M = Ga, Fe) based on ultrafast spectroscopy, but the interpretation of the results remains an open question. In this paper we interpreted the results with the aid of newly measured magnetic susceptibility, X-ray single crystal structural analysis, and band calculation. Observation of coherent phonons only in the lambda-type salts indicated that e-ph interaction should be characteristically strong in the A-type salts. By comparison of the observed carrier dynamics with a two-temperature model, the temperature-dependence of carrier dynamics is consistently explained by the different strengths of the e-ph interaction between the lambda- and the kappa-type salts. The difference in strength of the e-ph interactions is related to their crystal structures. In conclusion, their carrier dynamics is consistently interpreted and classified by their crystal structures.
78	Time-Resolved Photoresponse Measurements of the Electrical Conductivity of the Quasi-Two-Dimensional Organic Superconductor β-(BEDT-TTF)2I3 Using a Nanosecond Laser Pulse	2011/12	T. Iimori F. Sabeth T. Naito N. Ohta	J. Phys. Chem. C	115/ 48, 23998-24003	研究論文（学術雑誌）	10.1021/jp2088912			AMER CHEMICAL SOC	Time-resolved photoresponses in resistance have been measured following the nanosecond laser pulse excitation for the quasi-two-dimensional organic superconductors of hydrogenated and deuterated beta-(BEDT-TTF)(2)I-3 [BEDT-TTF = bis-(ethylenedithio)tetrathiafulvalene], which show two different superconducting states with high-T-c and low-T-c at temperatures near the critical temperatures. A transient increase of the resistance is induced by photoirradiation at all the temperatures, but a marked temperature dependence of the decay time is observed at temperatures close to the high-T-c phase transition temperature; the decay rate becomes faster and then becomes constant in both compounds, as the temperature decreases across the high-T-c phase transition temperature. The temperature dependence of the photoresponse intensity is different from the one expected from the bolometric effects, indicating the presence of the nonbolometric photoresponse. A possible mechanism explaining the photoresponse of the conductivity is discussed, based on the isotope effect on the photoresponse. A comparison is also made between beta-(BEDT-TTF)(2)I-3 and kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br for the transient photoresponse in resistance at temperatures across the metal-superconductor phase transition temperature.
79	Femtosecond Carrier Relaxation Dynamics and Photoinduced Phase Separation in κ-(BEDT-TTF)2Cu[N(CN)2]X (X=Br,Cl)	2011/11	Y. Toda T. Mertelj T. Naito D. Mihailovic	Phys. Rev. Lett.	107/ 22, 227002 (4 pages)-275	研究論文（学術雑誌）	10.1103/PhysRevLett.107.227002			AMER PHYSICAL SOC	We investigate the relaxation dynamics of nonequilibrium carriers in organic conductors kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]X (X = Br and Cl) using ultrafast time-resolved optical spectroscopy. The dynamics for both salts show similar temperature dependences, which is well characterized by the carrier relaxation across the pseudogap (PG) of the magnitude Delta(PG) approximate to 16 meV for Br salt and 7.0 meV for Cl salt. On the other hand, only the Br salt shows an abrupt increase of the decay time at low temperature, indicating an additional decay component associated with the superconducting (SC) gap below T-c. The fluence dependent dynamics at low temperature evidences the superposition of the SC component onto the PG component. These results indicate a metallic-insulating phase separation in the Br salt triggered by photoexcited nonequilibrium carriers.
80	Growth of Nanocrystals in a Single Crystal of Different Materials: A Way of Giving Function to Molecular Crystals	2011/02	Toshio Naito Akihiro Kakizaki Tamotsu Inabe Riu Sakai Eiji Nishibori Hiroshi Sawa	CRYSTAL GROWTH & DESIGN	11/ 2, 501-506	研究論文（学術雑誌）	10.1021/cg101295p			AMER CHEMICAL SOC	We have recently found that organic conductors Ag(DR)(2) (DR = 2,5-disubsituted-N,N'-dicyanoquinone amine; substituent (R) = CH(3), Cl, Br, I) irreversibly vary their electrical and magnetic properties by UV irradiation. By selecting the irradiation conditions (wavelengths, temperature, atmosphere, duration), one can accurately control the physical properties from metallic to insulating behavior while retaining their crystal structures. In order to clarify the mechanism of the conductivity change in the case of R = Cl, Br, and I, structure analysis of the irradiated crystals has been carried out. Transmittance electron microscopy and X-ray single crystal structure analysis clarified that the Ag(DCl)(2) crystals after 72 h irradiation (375 nm) contained single crystals of nearly three-dimensionally ordered AgCl (0.9 in mole fraction) with varying dimensions (similar to 1-50 nm). Owing to such a unique hybrid crystal structure, a highly nonlinear current-voltage characteristic unlike any existing electronic devices is observed on irradiated single Ag(DCl)(2) crystals.
81	Local Spin Susceptibility of α-D2I3 (D = bis(ethylendithio)tetraselenafulvalene (BETS) and bis(ethylendithio)dithiadiselenafulvalene (BEDT-STF)) Studied by 77Se NMR.	2011/01	K. Hiraki S. Harada K. Arai Y. Takano T. Takahashi N. Tajima R. Kato T. Naito	J. Phys. Soc. Jpn	80/ 1, 014715(6 pages)-1682	研究論文（学術雑誌）	10.1143/JPSJ.80.014715			PHYSICAL SOC JAPAN	We performed static susceptibility and Se-77 NMR measurements on alpha-(BETS)(2)I-3 and alpha-(BEDT-STF)(2)I-3 which are analogues of the "zero gap" system, alpha-(BEDT-TTF)(2)I-3 to systematically compare the electronic properties of the alpha-type I-3 systems, where BETS, BEDT-STF, and BEDT-TTF are bis(ethylendithio) tetraselenafulvalene, bis(ethylendithio) dithiadiselenafulvalene, and bis(ethylendithio) tetrathiafulvalene, respectively. From the analysis of the NMR lineshape for a polycrystalline sample at high temperatures, which are explained as an admixture of several powder patterns, we found that the local spin susceptibility is not uniform but at least one of the molecular sites has very small susceptibility. It was confirmed from single crystal data that there are three kinds of molecules with different local susceptibilities in a unit cell. The analysis of the angular dependence on a single crystal clarified that the relative magnitude of the local susceptibilities of A, B, and C molecules, chi(loc)(A), chi(loc)(B), and chi(loc)(C), are similar to those of the BEDT-TTF salt; chi(loc)(C) > chi(loc)(A) > chi(loc)(B). On the contrary, the temperature dependence of spin susceptibility and relaxation rate suggested a gap opening well above the metal-insulator transition, whereas no indication of symmetry breaking of the lattice was detected.
82	28aPS-58 微粒子混合系におけるパーコレーション(28aPS ポスターセッション,領域11(統計力学,物性基礎論,応用数学,力学,流体物理))	2011	眞山博幸, 山口大輔, 小泉智, 内藤俊雄	日本物理学会講演概要集	66/ 0				URL	一般社団法人日本物理学会
83	25aTA-1 STMによるα-(ET)_2l_3の室温電荷量解析II(25aTA 電荷秩序・非線形伝導,領域7(分子性固体・有機導体))	2011	森英一, 生井圭一郎, 坂本浩一, 溝口憲治, 内藤俊雄	日本物理学会講演概要集	66/ 0				URL	一般社団法人日本物理学会
84	26pTB-9 (TMTSF)_2ClO_4の圧力印加によるフェルミ面の変化(26pTB 擬一次元系,領域7(分子性固体・有機導体))	2011	鈴木勝博, 矢倉大資, 佐藤光幸, 内藤俊雄, 西尾豊, 梶田晃示	日本物理学会講演概要集	66/ 0				URL	一般社団法人日本物理学会
85	22aTR-8 巨大磁気抵抗を示すフタロシアニン分子系伝導体における電荷秩序の磁場誘起融解(22aTR π-d系,領域7(分子性固体・有機導体))	2011	花咲徳亮立石拓麻野上由夫松田真生田島裕之瀧川仁内藤俊雄稲辺保	日本物理学会講演概要集	66/ 0					一般社団法人日本物理学会
86	26aTB-6 巨大磁気抵抗を示すフタロシアニン分子系伝導体における電荷秩序の磁場中融解(26aTB π-d系,領域7(分子性固体・有機導体))	2011	立石拓麻花咲徳亮野上由夫松田真生田島裕之瀧川仁内藤俊雄稲辺保	日本物理学会講演概要集	66/ 0					一般社団法人日本物理学会
87	Stable π-π dependent electron conduction band of TPP[M(Pc)L2]2 molecular conductors (TPP = tetraphenylphosphonium;M = Co, Fe; Pc = phthalocyaninato; L = CN, Cl, Br).	2011	Derrick Ethelbhert C. Yu Masaki Matsuda Hiroyuki Tajima Toshio Naito Tamotsu Inabe	Dalton Trans.	40/ 10, 2283-2288	研究論文（学術雑誌）	10.1039/c0dt01054e			ROYAL SOC CHEMISTRY	The partially-oxidized TPP[M(Pc)L-2](2) molecular conductors exhibit variable electronic and magnetic transport bulk materials properties due to central metal and axial ligand molecular modifications. The controllable electrical conductivity and giant negative magnetoresistance can be mainly attributable to the varying ligand field energy and physical bulkiness of the axial ligands which cause modulation in the intra-molecular pi-d (Pc-M) and inter-molecular pi-pi (Pc-Pc) interactions in the TPP[M(Pc)L-2](2) system, respectively. Characterization of the electronic conduction band utilizing one-dimensional (1-D) tight-binding approximation from infrared reflectance and thermoelectric power profile reveal consistent band widths of 0.43 eV-0.62 eV for the Co series (L = Br < Cl < CN) and 0.44-0.56 eV for the Fe series (L = Br < Cl < CN). The fixed band width suggests that stable electron conduction bands (transport pathway) can be constructed which can withstand the molecular pi-d interaction modifications that severely alter the bulk electronic and magnetic materials properties of the TPP[M(Pc)L-2](2) molecular conductors.
88	Charge-transport in tin-iodide perovskite CH3NH3SnI3: origin of high conductivity	2011	Yukari Takahashi Rena Obara Zheng-Zhong Lin Yukihiro Takahashi Toshio Naito Tamotsu Inabe Shoji Ishibashi Kiyoyuki Terakura	DALTON TRANSACTIONS	40/ 20, 5563-5568	研究論文（学術雑誌）	10.1039/c0dt01601b			ROYAL SOC CHEMISTRY	The structural and electrical properties of a metal-halide cubic perovskite, CH3NH3SnI3, have been examined. The band structure, obtained using first-principles calculation, reveals a well-defined band gap at the Fermi level. However, the temperature dependence of the single-crystal electrical conductivity shows metallic behavior down to low temperatures. The temperature dependence of the thermoelectric power is also metallic over the whole temperature range, and the large positive value indicates that charge transport occurs with a low concentration of hole carriers. The metallic properties of this as-grown crystal are thus suggested to result from spontaneous hole-doping in the crystallization process, rather than the semi-metal electronic structure. The present study shows that artificial hole doping indeed enhances the conductivity.
89	Magnetic torque measurements of TPP[Fe(Pc)Br-2](2)	2010/06	M. Inoue K. Torizuka H. Tajima M. Matsuda D. E. C. Yu T. Naito T. Inabe N. Hanasaki	PHYSICA B-CONDENSED MATTER	405/ 11, S331-S333	研究論文（学術雑誌）	10.1016/j.physb.2009.11.023			ELSEVIER SCIENCE BV	Magnetic torque measurements of TPP[Fe(Pc)Br-2](2) are reported The torque curves for the magnetic field rotated within the ac plane exhibit a two-fold symmetry The temperature dependences of the torque amplitudes divided by the square of the field strength (tau(phi-45)/B-2) exhibit a drastic field dependence below 12K This field dependence is attributable to the fluctuation in the spontaneous magnetization that appears below 4 5 K The torque curves for the field rotated within the ab plane exhibit four-fold symmetry The curves are sinusoidal above 18K and exhibit saw-toothed shapes below similar to 12 K and complicated shapes below 8K. The complicated shapes suggest that both d-electrons and it-electrons form a magnetic order below 8K (C) 2009 Elsevier B V All rights reserved
90	Time-resolved optical study on BETS superconductors and related salts	2010/06	T. Naito M. Fukusaku S. Matsuo K. Tajima T. Inabe Y. Toda	PHYSICA B-CONDENSED MATTER	405/ 11, S269-S272	研究論文（学術雑誌）	10.1016/j.physb.2009.12.049			ELSEVIER SCIENCE BV	In order to compare the carrier dynamics in lambda-(BETS)(2)MCl4 (M=Ga Fe) and kappa-(ET)(2)X (X=Cu(NCS)(2) Cu[N(CN)(2)]Br Cu[N(CN)(2)]Cl) their polarized reflectance spectra were measured by a pump-probe method Polarization-dependences were compared among the different materials at varying temperatures The result indicated that each salt had anisotropy in the conduction planes corresponding to its crystallographic axes at all the temperatures of measurements (C) 2009 Elsevier B V All rights reserved
91	Photoresponse of electrical conductivity in an organic superconductor investigated by time-resolved resistance measurements	2010/06	T. Iimori T. Naito N. Ohta	PHYSICA B-CONDENSED MATTER	405/ 11, S347-S349	研究論文（学術雑誌）	10.1016/j.physb.2009.11.042			ELSEVIER SCIENCE BV	Photoirradiation effect on the electrical conductivity has been examined for an organic superconductor kappa-(BEDT-TrF)(2)Cu[N(CN)(2)]Br where BEDT-TTF represents bis(ethylenedithio)tetrathiafulvalene based on the time-resolved resistance measurements Visible laser pulses with a wavelength of 532 nm were irradiated on the crystal surface and the transient voltage signals induced by photoirradiation in the current-biased sample were monitored to obtain the transient time profile of the resistance The Increase of the resistance upon photoirradiation is observed with a slow decay lifetime of the order of millisecond both in the metallic phase and in the superconducting phase The time profiles are remarkably different from each other and a slow rise was observed only in the time profiles of the superconducting phase (C) 2009 Elsevier B V All rights reserved
92	Photoinduced switching of electrical conductivity and its memory effect in the organic conductor α-(BEDT-TTF)2I3: Dependence on voltage height and temporal width of pulsed voltages.	2010/06	T. Iimori T. Naito N. Ohta	Physica B	405/ 11, S344-S346	研究論文（学術雑誌）	10.1016/j.physb.2009.10.031			ELSEVIER SCIENCE BV	Unprecedented memory effect of photoinduced switching of the electrical conductivity in alpha-(BEDT-TTF)(2)I-3 controlled by the temporal width of square-wave pulsed voltages was reported where BEDT-TTF represents bis(ethylenedithio)tetrathiafulvalene [9] [limori et al 2009] Here further study has been done in order to examine whether the memory effect can be controlled by changing the height of the pulsed voltage Threshold values in the voltage height for the occurrence of the memory effect are characterized as a function of the width of pulsed voltages The relation between the threshold height and the pulse width can be altered by a load resistance connected to the sample in series in a measurement circuit It is also argued that time profiles of current observed in response to the application of pulsed voltages are inconsistent with a scenario in which the memory effect is ascribed to a temperature rise of the sample caused by photoirradiation and the successive application of pulsed voltages i e the memory effect is not a thermal effect (C) 2009 Elsevier B V All rights reserved
93	Carrier dynamics in organic magnetic superconductor and related salts κ,λ-(BETS)2MCl4 (M=Fe, Ga).	2010/05	T. Naito S. Matsuo T. Inabe Y. Toda	J. Phys.: Cond. Matter	22/ 18, 185701 (7pp)-4098	研究論文（学術雑誌）	10.1088/0953-8984/22/18/185701			IOP PUBLISHING LTD	In order to compare the carrier dynamics and reveal the origin of differences in their electrical behaviour, time-resolved reflectivity changes were measured on single crystals of the title compounds. The observed relaxation behaviour explained well their electrical behaviour, and indicated that different conduction mechanisms dominated kappa-and lambda-type BETS salts, irrespective of local spins, at about 8-100 K; the electrical behaviour of the kappa-type salts is governed by relaxation times of carriers and/or density of states at the Fermi levels, while that of the lambda-type salts is dominated by the latter.
94	Time-resolved measurement of the photoinduced change in the electrical conductivity of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br.	2010/05	T. Iimori T. Naito N. Ohta	J. Phys. Chem. C	114/ 19, 9070-9075	研究論文（学術雑誌）	10.1021/jp912204n			AMER CHEMICAL SOC	Photoinduced change in the electrical conductivity of a single crystal of kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br (kappa-Br) has been examined at various temperatures in the vicinity of the metal superconductor phase-transition temperature (T-c) with a nanosecond visible laser pulse. The transient change of the electric potential difference was measured following photoirradiation, and the time profile of the electrical conductivity was obtained in the current-biased sample. Upon photoirradiation, the bulk resistance increases at all the temperatures under the present study. However, the decay profile shows a marked temperature dependence, and a prolongation of the decay time is observed at temperatures just below T-c. The relaxation times below and above T-c are different from each other, and unconventional asymmetry of the critical slowing down about T-c is found. The presence of a nonthermal (nonbolometric) photoirradiation effect is confirmed in the superconducting phase of kappa-Br based on the analysis of the temperature dependence of the photoresponse in the conductivity.
95	Self-Organized Anionic Networks in Quaternary Ammonium and Phosphonium Salts of Mellitate	2010/05	Hiromi Minemawari Toshio Naito Tamotsu Inabe	BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN	83/ 5, 505-513	研究論文（学術雑誌）	10.1246/bcsj.20090323			CHEMICAL SOC JAPAN	Mellitate is a unique anion that can form hydrogen-bonding anionic networks. In this study, crystal structures of the salts with quaternary ammonium and phosphonium cations that bear no hydrogen-bonding functional groups are investigated. When the number of deprotonation (n) from the parent mellitic acid is one, two kinds of networks, a two-dimensional sheet and a three-dimensional network containing helical chains, have been obtained. Both networks involve a common network motif, and this variation arises from the difference in the connection sequence of the motif. When n = 2, a rhombic motif that frequently occurs in the salts with proton-donating cations is also found to form. However, the vacant proton accepting sites of the anions are occupied by water molecules, and a sheet-like network with corner-sharing connection of the rhombic motifs occurs. For the salt of n = 3, a triangular motif that has commonly been found in the other mellitate salts of n = 3 with proton-donating cations is also involved in the network. Because the charge density in the simple two-dimensional sheet composed solely of the triangular motif is rather high, the network is divided into one-dimensional belts.
96	Ag L-3-Edge X-ray Absorption Near-Edge Structure of 4d(10) (Ag+) Compounds: Origin of the Edge Peak and Its Chemical Relevance	2010/04	Takeshi Miyamoto Hironobu Niimi Yoshinori Kitajima Toshio Naito Kiyotaka Asakura	JOURNAL OF PHYSICAL CHEMISTRY A	114/ 12, 4093-4098	研究論文（学術雑誌）	10.1021/jp907669s			AMER CHEMICAL SOC	A peak appearing at the L-2,L-3 X-ray absorption edge often provides the number of empty d states of the X-ray absorbing atoms. Ag+ compounds have a d(10) state (no d empty states) but Show a small peak at the edge. In this research, we systematically studied the edge peak of Ag+ compounds to Understand its origin oil the basis of the molecular Orbital picture and to obtain a relation of the edge peak intensity to chemical and physical quantities. The edge peak call be formally assigned to the transition from 2p to 5s enhanced by the s-d hybridization. The peak intensity has a negative correlation with I coordination charge but has a positive correlation with the strength of the covalent bond, which is in the reverse order to the other d(n) (n < 10) elements.
97	小中学生を対象とした化学実験	2010/02/01	内藤俊雄	化学と工業 = Chemistry and chemical industry	63/ 2				URL
98	22pGS-13 有機結晶接触界面におけるキャリヤ注入とその伝導特性(22pGS 界面デバイス2,領域7(分子性固体・有機導体))	2010	高橋幸裕, 早川渓, 内藤俊雄, 稲辺保	日本物理学会講演概要集	65/ 0				URL	一般社団法人日本物理学会
99	23pWP-12 擬一次元ジシアノフタロシアニン錯体のESR測定(23pWP 量子スピン(一次元系),領域3(磁性,磁気共鳴))	2010	木俣基, 稲辺保, 吉田泰輔, 田島裕之, 宇治進也, 竹端寛治, 今中康貴, 高増正, 松田真生, 内藤俊雄	日本物理学会講演概要集	65/ 0				URL	一般社団法人日本物理学会
100	24aRB-8 擬1次元有機伝導体(TMTSF)_2ClO_4の磁気抵抗効果(24aRB 擬一次元物質,領域7(分子性固体・有機導体))	2010	鈴木勝博, 佐藤光幸, 菅原滋晴, 内藤俊雄, 西尾豊, 梶田晃示	日本物理学会講演概要集	65/ 0				URL	一般社団法人日本物理学会

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