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

Hiroshi Watanabe; Masao Ogata

doi:10.1143/JPSJ.75.063702

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

Hiroshi Watanabe^*, Masao Ogata

^*Corresponding author for this work

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

66 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 t_c/t_p.

Original language	English
Article number	063702
Journal	Journal of the Physical Society of Japan
Volume	75
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.75.063702
Publication status	Published - 2006 Jun
Externally published	Yes

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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10.1143/JPSJ.75.063702

Cite this

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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.",

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AU - Watanabe, Hiroshi

AU - Ogata, Masao

PY - 2006/6

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N2 - 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.

AB - 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.

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

Abstract

Keywords

ASJC Scopus subject areas

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