Electrical and structural properties of θ-type BEDT-TTF organic conductors under uniaxial strain

Ryusuke Kondo, Momoka Higa, Seiichi Kagoshima, Hirotada Hoshino, Takehiko Mori, Hatsumi Mori

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

In order to investigate the relationships between crystal structures and electronic properties of θ-type BEDT-TTF organic conductors, electrical properties of θ-(BEDT-TTF) 2Ag(CN) 2 and θ-(BEDT-TTF) 2CsZn(SCN) 4 and crystal structures of θ-(BEDT-TTF) 2CsZn(SCN) 4 under uniaxial strain are investigated. The resistivity measurements for both salts under uniaxial strain show that the intercolumnar uniaxial strain preserves the metallic nature while the intra-columnar one induces an insulating behavior, which are reminiscent of the charge-ordered state of θ-(BEDT-TTF) 2RbZn(SCN) 4. Structure analyses of θ-(BEDT-TTF) 2CsZn(SCN) 4 under uniaxial strain indicate that the inter-columnar strain slightly increases the diagonal transfer integral but does not vary the vertical one, and the intra-columnar uniaxial strain largely increases the vertical transfer integral but does not change the diagonal one. Based on these experimental results, the key parameters to determine the electrical properties of θ-type BEDT-TTF salts are discussed. It is suggested that the transfer integral along the intra-columnar direction dominates the occurence of the charge-ordered state.

Original languageEnglish
Article number044716
Journaljournal of the physical society of japan
Volume75
Issue number4
DOIs
Publication statusPublished - Apr 1 2006
Externally publishedYes

Keywords

  • BEDT-TTF salt
  • Crystal structure analysis
  • Electrical property
  • Uniaxial strain
  • θ-type

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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