Novel charge order and superconductivity in two-dimensional frustrated lattice at quarter filling

Hiroshi Watanabe, Masao Ogata

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Motivated by the various physical properties observed in θ-(BEDT-TTF)2X, we study the ground state of an extended Hubbard model on two-dimensional anisotropic triangular lattice at 1/4-filling with the variational Monte Carlo method. It is shown that the nearest-neighbor Coulomb interaction enhances charge fluctuation and it induces anomalous states such as the charge-ordered metallic state and triplet next-nearest-neighbor f-wave superconductivity. We consider that these results can explain the coexistence of different charge orders observed in the case of X = CsCo(SCN)4 and superconductivity in the case of X = I3. We then propose a unified view of the family of organic conductors θ-(BEDT-TTF)2X with the value of tc/tp.

Original languageEnglish
Article number063702
JournalJournal of the Physical Society of Japan
Volume75
Issue number6
DOIs
Publication statusPublished - 2006 Jun
Externally publishedYes

Keywords

  • θ-(BEDT-TTF)X
  • Charge fluctuation
  • Charge order
  • Organic conductor
  • Superconductivity
  • Variational Monte Carlo method

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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