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

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

Research output: Contribution to journalArticlepeer-review

60 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 languageEnglish (US)
Pages (from-to)1816-1819
Number of pages4
JournalJournal of the Physical Society of Japan
Volume71
Issue number8
DOIs
StatePublished - Aug 2002

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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