X-ray evidence for structural changes in the organic conductors, α-(BEDT-TTF)2I3, α-(BEDT-TTF)2IBr2 and ß-(BEDT-TTF)2I3

Y. Nogami; S. Kagoshima; T. Sugano; G. Saito

doi:10.1016/0379-6779(86)90173-6

X-ray evidence for structural changes in the organic conductors, α-(BEDT-TTF)₂I₃, α-(BEDT-TTF)₂IBr₂ and ß-(BEDT-TTF)₂I₃

Y. Nogami, S. Kagoshima, T. Sugano, G. Saito

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

Interrelations are investigated between the electrical and structural properties of organic conductors, BEDT-TTF (bis(ethylenedithiolo)tetrathiafulvalene) trihalides. In α-)BEDT-TTF)₂I₃ evidence is obtained by X-ray diffraction for BEDT-TTF molecular dimerization at the metal-insulator transition temperature of 135 K. Another BEDT-TTF molecular dimerization is found in α-(BEDT-TTF)₂IBr₂, which has semiconducting properties and an activation energy that increases with decreasing temperature. These dimerizations are considered to be responsible for the changes in the electrical properties. Superconducting ß-(BEDT-TTF)₂I₃ is found to have a superstructure below 175 K, above which short-range fluctuations are observed up to about 200 K.

Original language	English
Pages (from-to)	367-377
Number of pages	11
Journal	Synthetic Metals
Volume	16
Issue number	3
DOIs	https://doi.org/10.1016/0379-6779(86)90173-6
Publication status	Published - Dec 1986
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/0379-6779(86)90173-6

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@article{ffe98f75e0cc401994435999b51dda0e,

title = "X-ray evidence for structural changes in the organic conductors, α-(BEDT-TTF)2I3, α-(BEDT-TTF)2IBr2 and {\ss}-(BEDT-TTF)2I3",

abstract = "Interrelations are investigated between the electrical and structural properties of organic conductors, BEDT-TTF (bis(ethylenedithiolo)tetrathiafulvalene) trihalides. In α-)BEDT-TTF)2I3 evidence is obtained by X-ray diffraction for BEDT-TTF molecular dimerization at the metal-insulator transition temperature of 135 K. Another BEDT-TTF molecular dimerization is found in α-(BEDT-TTF)2IBr2, which has semiconducting properties and an activation energy that increases with decreasing temperature. These dimerizations are considered to be responsible for the changes in the electrical properties. Superconducting {\ss}-(BEDT-TTF)2I3 is found to have a superstructure below 175 K, above which short-range fluctuations are observed up to about 200 K.",

author = "Y. Nogami and S. Kagoshima and T. Sugano and G. Saito",

note = "Funding Information: We would like to thank Mr. H. Kawamura and Professor T. Takahashi for the high pressure application, Dr. M. Tokumoto for useful suggestions, and Professor H. Kobayashi and Dr. J. P. Pouget for helpful comments. We cordially thank also Drs. J. M. Williams and M. A. Beno for providing us with the results of X-ray structure analysis of c~-(BEDT-TTF)2IBr: prior to publication. This work is supported by a Grant in Aid for Special Project Research from the Ministry of Education, Science and Culture.",

year = "1986",

month = dec,

doi = "10.1016/0379-6779(86)90173-6",

language = "English",

volume = "16",

pages = "367--377",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "Elsevier BV",

number = "3",

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TY - JOUR

T1 - X-ray evidence for structural changes in the organic conductors, α-(BEDT-TTF)2I3, α-(BEDT-TTF)2IBr2 and ß-(BEDT-TTF)2I3

AU - Nogami, Y.

AU - Kagoshima, S.

AU - Sugano, T.

AU - Saito, G.

N1 - Funding Information: We would like to thank Mr. H. Kawamura and Professor T. Takahashi for the high pressure application, Dr. M. Tokumoto for useful suggestions, and Professor H. Kobayashi and Dr. J. P. Pouget for helpful comments. We cordially thank also Drs. J. M. Williams and M. A. Beno for providing us with the results of X-ray structure analysis of c~-(BEDT-TTF)2IBr: prior to publication. This work is supported by a Grant in Aid for Special Project Research from the Ministry of Education, Science and Culture.

PY - 1986/12

Y1 - 1986/12

N2 - Interrelations are investigated between the electrical and structural properties of organic conductors, BEDT-TTF (bis(ethylenedithiolo)tetrathiafulvalene) trihalides. In α-)BEDT-TTF)2I3 evidence is obtained by X-ray diffraction for BEDT-TTF molecular dimerization at the metal-insulator transition temperature of 135 K. Another BEDT-TTF molecular dimerization is found in α-(BEDT-TTF)2IBr2, which has semiconducting properties and an activation energy that increases with decreasing temperature. These dimerizations are considered to be responsible for the changes in the electrical properties. Superconducting ß-(BEDT-TTF)2I3 is found to have a superstructure below 175 K, above which short-range fluctuations are observed up to about 200 K.

AB - Interrelations are investigated between the electrical and structural properties of organic conductors, BEDT-TTF (bis(ethylenedithiolo)tetrathiafulvalene) trihalides. In α-)BEDT-TTF)2I3 evidence is obtained by X-ray diffraction for BEDT-TTF molecular dimerization at the metal-insulator transition temperature of 135 K. Another BEDT-TTF molecular dimerization is found in α-(BEDT-TTF)2IBr2, which has semiconducting properties and an activation energy that increases with decreasing temperature. These dimerizations are considered to be responsible for the changes in the electrical properties. Superconducting ß-(BEDT-TTF)2I3 is found to have a superstructure below 175 K, above which short-range fluctuations are observed up to about 200 K.

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X-ray evidence for structural changes in the organic conductors, α-(BEDT-TTF)₂I₃, α-(BEDT-TTF)₂IBr₂ and ß-(BEDT-TTF)₂I₃

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