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 journalArticle

41 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 languageEnglish
Pages (from-to)367-377
Number of pages11
JournalSynthetic Metals
Volume16
Issue number3
DOIs
Publication statusPublished - Dec 1986
Externally publishedYes

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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