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LOW-TEMPERATURE ELECTRICAL-CONDUCTIVITY OF HIGHLY CONDUCTING IODINE-DOPED POLYACETYLENE 査読

H KANEKO, Y NOGAMI, T ISHIGURO, H NISHIYAMA, H ISHIMOTO, A TAKAHASHI, J TSUKAMOTO

SYNTHETIC METALS 57 ( 2-3 ) 4888 - 4893 1993年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA LAUSANNE

The low temperature electrical conductivities of heavily iodine-doped polyacetylene with different degrees of disorder are reported. The sample with room-temperature conductivity of 1.0 x 10(5) S/cm showed weak temperature dependence below 1 K down to 0.8 mK. With moderate increase of disorder, logarithmic temperature dependence was observed. The results are interpreted in terms of scattering of conduction carriers accompanying change of atomic configurations of equivalent energy in the polymer backbone, after similar process in amorphous metal alloys.

DOI： 10.1016/0379-6779(93)90834-J

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HIGH-ELECTRIC-FIELD EFFECT ON THE CONDUCTIVITY OF IODINE-DOPED POLYACETYLENE 査読

Y NOGAMI, M YAMASHITA, H KANEKO, T ISHIGURO, J TSUKAMOTO, A TAKAHASHI

SYNTHETIC METALS 57 ( 2-3 ) 4854 - 4859 1993年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA LAUSANNE

The conductivities of iodine-doped new polyacetylenes with room-temperature values of 7.7 x 10(3) S/cm and 2.6 x 10(4) S/cm were measured as a function of applied electric field in the temperature range of 77 K to 4.2 K. It is shown that the behavior deviated obviously from the Sheng model which has been widely adopted in explaining temperature dependence for conventional polyacetylene with lower conductivity.

DOI： 10.1016/0379-6779(93)90828-K

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NONLINEAR ELECTRICAL-CONDUCTIVITY OF HIGHLY CONDUCTING IODINE-DOPED POLYACETYLENE 査読

Y NOGAMI, M YAMASHITA, H KANEKO, T ISHIGURO, A TAKAHASHI, J TSUKAMOTO

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 62 ( 2 ) 664 - 671 1993年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PHYSICAL SOC JAPAN

Non-ohmic behaviors under high electric field were investigated for highly conducting iodine-doped polyacetylene at different temperatures. The field dependence was enhanced with decrease of measuring temperature and conductivity. Through systematic numerical analysis we show that the high-field characteristics at different temperatures cannot be described consistently by Sheng model which has been utilized for analyzing the temperature dependence of conventional polyacetylene.

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LOGARITHMIC TEMPERATURE-DEPENDENCE OF RESISTIVITY IN HEAVILY DOPED CONDUCTING POLYMERS AT LOW-TEMPERATURE 査読

T ISHIGURO, H KANEKO, Y NOGAMI, H ISHIMOTO, H NISHIYAMA, J TSUKAMOTO, A TAKAHASHI, M YAMAURA, T HAGIWARA, K SATO

PHYSICAL REVIEW LETTERS 69 ( 4 ) 660 - 663 1992年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMERICAN PHYSICAL SOC

Electrical resistivities of heavily doped polyacetylene and polypyrrole exhibit a wide range of temperature variation as a function of the degree of disorder. Thermal activation behavior is found for the strongly disordered state, while a weak temperature dependence down to the mK region is found for the weakly disordered state. In the intermediate region we found the resistivity represented by a logT dependence, in a manner similar to amorphous metals. As a cause of the logT dependence, the possibility of scattering via interaction with molecular configurations possessing low-energy internal degrees of freedom is considered.

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UNUSUAL X-RAY-DIFFRACTION VECTOR SHIFT OBSERVED IN HETEROGENEOUS LANGMUIR-BLODGETT MULTILAYER FILMS 査読

Y NOGAMI, K OGASAWARA, S TAKEUCHI, T ISHIGURO, K OHSUMI, Y SHIMIZUGAWA

ELECTRICAL, OPTICAL, AND MAGNETIC PROPERTIES OF ORGANIC SOLID STATE MATERIALS 247 835 - 840 1992年

SUPERCONDUCTING TRANSITION IN KAPPA-BEDT-TTF SALTS UNDER MAGNETIC-FIELD 査読

H ITO, Y NOGAMI, M WATANABE, T ISHIGURO, T KOMATSU, G SAITO, N HOSOITO

ELECTRICAL, OPTICAL, AND MAGNETIC PROPERTIES OF ORGANIC SOLID STATE MATERIALS 247 495 - 500 1992年

SUPERCONDUCTING TRANSITION IN KAPPA-(BEDT-TTF)2CU[N(CN)2]BR UNDER MAGNETIC-FIELD 査読

H ITO, M WATANABE, Y NOGAMI, T ISHIGURO, T KOMATSU, G SAITO, N HOSOITO

PHYSICA C 185 2659 - 2660 1991年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

Interlayer and intralayer coherence lengths of kappa-(BEDT-TTF)2Cu[N(CN)2]Br are derived as xi-b(0) = 6 +/- 2 angstrom, xi-ac(0) = 24 +/- 5 angstrom, respectively, by magnetic measurement. The renormalized theory of the order parameter fluctuation near the superconducting transition region was employed for the analysis. The broad resistive transitions under magnetic field are discussed on the same footing.

DOI： 10.1016/0921-4534(91)91451-9

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Magnetic determination of ginzburg-landau coherence length for organic superconductor κ-(BEDT-TTF)2 X (X = Cu(NCS)2, CuLN(CN)2]Br): Effect of isotope substitution 査読

Hiroshi Ito, Masashi Watanabe, Yoshio Nogami, Takehiko Ishiguro, Tokutaro Komatsu, Gunzi Saito, Nobuyoshi Hosoito

Journal of the Physical Society of Japan 60 ( 10 ) 3230 - 3233 1991年10月

記述言語：英語出版者・発行元：一般社団法人日本物理学会

The Ginzburg-Landau coherence lengths are determined from the temperature dependence of the magnetization by fitting measured results with the renormalization theory of the fluctuation developed for layered superconductors. The derived interlayer coherence lengths are 6 ± 2 Å and 3.2 ± 0.5 Å for κ-(BEDTTTF)2 Cu[N(CN)2]Br and ,κ-(BEDT-TTF)2Cu(NCS)2, respectively, which are remarkably shorter than the interlayer spacing. It is also found that these coherence lengths are virtually unaffected by isotope substitution in BEDT-TTF molecules.

DOI： 10.1143/JPSJ.60.3230

OVERVIEW OF ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)2[CU(NCS)2] AND ITS RELATED MATERIALS 査読

G SAITO, H YAMOCHI, T NAKAMURA, T KOMATSU, T ISHIGURO, Y NOGAMI, Y ITO, H MORI, K OSHIMA, M NAKASHIMA, S UCHIDA, H TAKAGI, S KAGOSHIMA, T OSADA

SYNTHETIC METALS 42 ( 1-2 ) 1993 - 1998 1991年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA LAUSANNE

Crystal structures and physical properties of organic superconductors kappa-(BEDT-TTF)2Cu(NCS)2, kappa-(BEDT-TTF)2Cu[N(CN)2]Br and alpha-(BEDT-TTF)2[NH4Hg(SCN)4] are discussed. The Cu(NCS)2 salt shows an inverse isotope effect. The Cu[N(CN)2]Br salt shows Tc of 11.7-11.8K. Conductivities, Hc2 values and lattice parameters of these kappa-type salts are compared.

DOI： 10.1016/0379-6779(91)91998-P

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TENSILE STRAIN EFFECTS ON KAPPA-(BEDT-TTF)2CU(NCS)2 査読

T ISHIGURO, H ITO, Y NOGAMI, Y UEBA, H KUSUHARA

SYNTHETIC METALS 42 ( 1-2 ) 1911 - 1914 1991年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA LAUSANNE

Through the comparison of uniaxial and biaxial tensile strain experiments with the calculated, the dominance of the interlayer interaction for the superconductivity and the resistance maximum in kappa-(BEDT-TTF)2Cu(NCS)2 is presented.

DOI： 10.1016/0379-6779(91)91979-K

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ELECTRONIC STATE DENSITY OF HIGHLY CONDUCTING POLYACETYLENE 査読

Y NOGAMI, H KANEKO, T ISHIGURO, N HOSOITO, J TSUKAMOTO, A TAKAHASHI

SYNTHETIC METALS 41 ( 1-2 ) 117 - 120 1991年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA LAUSANNE

The density of states of heavily I-doped highly conducting polyacetylene (HCPA) is evaluated through the magnetic susceptibility and the thermoelectric power measurements. According to the magnetic susceptibility, the density grows from approximately 4 % (in I-3-unit) doping level, in agreement with previous reports, but the attained value at approximately 9 % (saturating doping level) becomes larger than that for conventional polyacetylene.

DOI： 10.1016/0379-6779(91)91015-3

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LOW-TEMPERATURE TRANSPORT-PROPERTIES OF HIGHLY CONDUCTING POLYACETYLENE 査読

Y NOGAMI, H KANEKO, H ITO, T ARAI, A MATSUBARA, T ISHIGURO, N TOYOTA, T SASAKI, J TSUKAMOTO, A TAKAHASHI

SYNTHETIC METALS 41 ( 1-2 ) 95 - 98 1991年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA LAUSANNE

The temperature dependence of the electrical conductivity of the newly developed highly conducting polyacetylene, down to 60 mK, and its high field magnetoconductance up to 15 T are presented. The observed positive magnetoconductance for the most conducting sample exceeds by far the value based on the weak localization theory. The low temperature transport properties vary drastically with small change in the room-temperature conductivity, suggesting that the metallic conduction is realized in the scheme close to metal-nonmetal boundary.

DOI： 10.1016/0379-6779(91)91008-X

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LOW-TEMPERATURE ELECTRICAL-CONDUCTIVITY OF HIGHLY CONDUCTING POLYACETYLENE IN A MAGNETIC-FIELD 査読

NOGAMI Y, KANEKO H, ITO H, ISHIGURO T, SASAKI T, TOYOTA N, TAKAHASHI A, TSUKAMOTO J

Physical Review B 43 ( 14 ) 11829 - 11839 1991年

ON THE METALLIC STATES IN HIGHLY CONDUCTING IODINE-DOPED POLYACETYLENE 査読

Y NOGAMI, H KANEKO, T ISHIGURO, A TAKAHASHI, J TSUKAMOTO, N HOSOITO

SOLID STATE COMMUNICATIONS 76 ( 5 ) 583 - 586 1990年11月

HIGH-RESOLUTION X-RAY-SCATTERING STUDY OF THE ANION ORDERING PHASE-TRANSITION OF (TMTSF)2CLO4 査読

JP POUGET, S KAGOSHIMA, T TAMEGAI, Y NOGAMI, K KUBO, T NAKAJIMA, K BECHGAARD

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 59 ( 6 ) 2036 - 2053 1990年6月

THE SUPERSTRUCTURE OF THE ORGANIC SUPERCONDUCTOR BETA-(BEDT-TTF)2I3 UNDER PRESSURE 査読

Y NOGAMI, S KAGOSHIMA, H ANZAI, M TOKUMOTO, N MORI, N KINOSHITA, G SAITO

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 59 ( 1 ) 259 - 265 1990年1月

UNIAXIAL-STRESS EFFECTS ON ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)2CU(NCS)2 査読

T ISHIGURO, H ITO, Y NOGAMI, Y UEBA, H KUSUHARA

ORGANIC SUPERCONDUCTIVITY 123 - 131 1990年

STRUCTURAL STUDIES OF (TMTSF)2SBCL2F4, ALPHA-(BEDT-TTF)2L3 AND SOME ORGANIC SUPERCONDUCTORS FOUND RECENTLY 査読

S KAGOSHIMA, Y NOGAMI

JOURNAL OF MOLECULAR ELECTRONICS 5 ( 4 ) 201 - 206 1989年10月

2K-SUPERCONDUCTING STATE WITH LESS DISORDER IN THE ORGANIC SUPERCONDUCTOR BETA-(BEDT-TTF)2I3 査読

S KAGOSHIMA, M HASUMI, Y NOGAMI, N KINOSHITA, H ANZAI, M TOKUMOTO, G SAITO

SOLID STATE COMMUNICATIONS 71 ( 10 ) 843 - 846 1989年9月

A CHANGE OF THE SUPERSTRUCTURE AND AN ASSOCIATED RISE OF THE SUPERCONDUCTING CRITICAL-TEMPERATURE IN THE ORGANIC SUPERCONDUCTOR BETA-(BEDT-FFT)2I3 査読

S KAGOSHIMA, Y NOGAMI, M HASUMI, H ANZAI, M TOKUMOTO, G SAITO, N MORI

SOLID STATE COMMUNICATIONS 69 ( 12 ) 1177 - 1180 1989年3月

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