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

doi:10.1143/JPSJ.75.044716

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 journal › Article › peer-review

19 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 language	English
Article number	044716
Journal	journal of the physical society of japan
Volume	75
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.75.044716
Publication status	Published - Apr 2006
Externally published	Yes

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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10.1143/JPSJ.75.044716

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title = "Electrical and structural properties of θ-type BEDT-TTF organic conductors under uniaxial strain",

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.",

keywords = "BEDT-TTF salt, Crystal structure analysis, Electrical property, Uniaxial strain, θ-type",

author = "Ryusuke Kondo and Momoka Higa and Seiichi Kagoshima and Hirotada Hoshino and Takehiko Mori and Hatsumi Mori",

year = "2006",

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doi = "10.1143/JPSJ.75.044716",

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T1 - Electrical and structural properties of θ-type BEDT-TTF organic conductors under uniaxial strain

AU - Kondo, Ryusuke

AU - Higa, Momoka

AU - Kagoshima, Seiichi

AU - Hoshino, Hirotada

AU - Mori, Takehiko

AU - Mori, Hatsumi

PY - 2006/4

Y1 - 2006/4

N2 - 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.

AB - 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.

KW - BEDT-TTF salt

KW - Crystal structure analysis

KW - Electrical property

KW - Uniaxial strain

KW - θ-type

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

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