Charge order and superconductivity in two-dimensional triangular lattice at n = 2/3

Hiroshi Watanabe; Masao Ogata

doi:10.1143/JPSJ.74.2901

Charge order and superconductivity in two-dimensional triangular lattice at n = 2/3

Hiroshi Watanabe^*, Masao Ogata

^*Corresponding author for this work

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

34 Citations (Scopus)

Abstract

To investigate the possibility of charge order and superconductivity in a doped two-dimensional triangular lattice, we study an extended Hubbard model with the variational Monte Carlo method. At n = 2/3, a commensurate filling for a triangular lattice, it is shown that the nearest-neighbor Coulomb interaction V induces honeycomb-type charge order and antiferromagnetic spin order at U ≳ 10t. We also discuss the possibility of superconductivity induced by charge fluctuation and the relation to the superconductivity in Na _0.35CoO₂·1.3H₂O and θ-type organic condoctors.

Original language	English
Pages (from-to)	2901-2904
Number of pages	4
Journal	Journal of the Physical Society of Japan
Volume	74
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.74.2901
Publication status	Published - 2005 Nov
Externally published	Yes

Keywords

θ-type organic conductor
Charge fluctuation
Charge order
NaCoO ·1.3HO
Superconductivity
Variational Monte Carlo method

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.74.2901

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abstract = "To investigate the possibility of charge order and superconductivity in a doped two-dimensional triangular lattice, we study an extended Hubbard model with the variational Monte Carlo method. At n = 2/3, a commensurate filling for a triangular lattice, it is shown that the nearest-neighbor Coulomb interaction V induces honeycomb-type charge order and antiferromagnetic spin order at U ≳ 10t. We also discuss the possibility of superconductivity induced by charge fluctuation and the relation to the superconductivity in Na 0.35CoO2·1.3H2O and θ-type organic condoctors.",

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AB - To investigate the possibility of charge order and superconductivity in a doped two-dimensional triangular lattice, we study an extended Hubbard model with the variational Monte Carlo method. At n = 2/3, a commensurate filling for a triangular lattice, it is shown that the nearest-neighbor Coulomb interaction V induces honeycomb-type charge order and antiferromagnetic spin order at U ≳ 10t. We also discuss the possibility of superconductivity induced by charge fluctuation and the relation to the superconductivity in Na 0.35CoO2·1.3H2O and θ-type organic condoctors.

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KW - Charge fluctuation

KW - Charge order

KW - NaCoO ·1.3HO

KW - Superconductivity

KW - Variational Monte Carlo method

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Charge order and superconductivity in two-dimensional triangular lattice at n = 2/3

Abstract

Keywords

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