Charge Ordering in θ-(BEDT-TTF)2X Materials

R. Torsten Clay; Sumit Mazumdar; David K. Campbell

doi:10.1143/JPSJ.71.1816

Charge Ordering in θ-(BEDT-TTF)₂X Materials

R. Torsten Clay, Sumit Mazumdar, David K. Campbell

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

61 Scopus citations

Abstract

We theoretically investigate charge ordered states on the anisotropic triangular lattice characteristic of the θ-(BEDT-TTF)₂X materials. Using exact diagonalization studies, we establish that the charge order (CO) pattern corresponds to a "horizontal" stripe structure, with ... 1100... CO along the two directions with larger electron hopping (p-directions), and ... 1010... CO along the third direction (c-direction). The CO is accompanied by co-operative bond dimerizations along all three directions in the highest spin state. In the lowest spin state bonds along the p-directions are tetramerized. Our theory explains the occurrence of a charge-induced high temperature transition as well as a spin gap transition at lower temperature.

Original language	English (US)
Pages (from-to)	1816-1819
Number of pages	4
Journal	Journal of the Physical Society of Japan
Volume	71
Issue number	8
DOIs	https://doi.org/10.1143/JPSJ.71.1816
State	Published - Aug 2002

Keywords

BEDT-TTF
Charge ordering
Charge-density wave
Spin gap
Superconductivity

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1143/JPSJ.71.1816

Cite this

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title = "Charge Ordering in θ-(BEDT-TTF)2X Materials",

abstract = "We theoretically investigate charge ordered states on the anisotropic triangular lattice characteristic of the θ-(BEDT-TTF)2X materials. Using exact diagonalization studies, we establish that the charge order (CO) pattern corresponds to a {"}horizontal{"} stripe structure, with ... 1100... CO along the two directions with larger electron hopping (p-directions), and ... 1010... CO along the third direction (c-direction). The CO is accompanied by co-operative bond dimerizations along all three directions in the highest spin state. In the lowest spin state bonds along the p-directions are tetramerized. Our theory explains the occurrence of a charge-induced high temperature transition as well as a spin gap transition at lower temperature.",

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AU - Mazumdar, Sumit

AU - Campbell, David K.

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N2 - We theoretically investigate charge ordered states on the anisotropic triangular lattice characteristic of the θ-(BEDT-TTF)2X materials. Using exact diagonalization studies, we establish that the charge order (CO) pattern corresponds to a "horizontal" stripe structure, with ... 1100... CO along the two directions with larger electron hopping (p-directions), and ... 1010... CO along the third direction (c-direction). The CO is accompanied by co-operative bond dimerizations along all three directions in the highest spin state. In the lowest spin state bonds along the p-directions are tetramerized. Our theory explains the occurrence of a charge-induced high temperature transition as well as a spin gap transition at lower temperature.

AB - We theoretically investigate charge ordered states on the anisotropic triangular lattice characteristic of the θ-(BEDT-TTF)2X materials. Using exact diagonalization studies, we establish that the charge order (CO) pattern corresponds to a "horizontal" stripe structure, with ... 1100... CO along the two directions with larger electron hopping (p-directions), and ... 1010... CO along the third direction (c-direction). The CO is accompanied by co-operative bond dimerizations along all three directions in the highest spin state. In the lowest spin state bonds along the p-directions are tetramerized. Our theory explains the occurrence of a charge-induced high temperature transition as well as a spin gap transition at lower temperature.

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KW - Spin gap

KW - Superconductivity

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