Superconductivity due to charge fluctuation in θ-type organic conductors

Yasuhiro Tanaka; Youichi Yanase; Masao Ogata

doi:10.1143/JPSJ.73.2053

Superconductivity due to charge fluctuation in θ-type organic conductors

Yasuhiro Tanaka^*, Youichi Yanase, Masao Ogata

^*Corresponding author for this work

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

38 Citations (Scopus)

Abstract

Superconductivity close to charge ordering in quasi-two-dimensional 3/4-filled organic compounds is investigated for the θ-type structure. The effect of spin and charge fluctuations is calculated within random phase approximation for a relevant extended Hubbard model with both on-site (U) and intersite (V) Coulomb interactions on an anisotropic triangular lattice. It is found that both spin and charge fluctuations induce superconductivity with extended s-wave singlet pairing, which is similar to the d_xy pairing state in the square lattice. In the vicinity of charge-density-wave instability, f-wave triplet pairing is also stable due to the effect of nearest-neighbor Coulomb interaction. The temperature dependences of superconductivity and charge-density-wave phase boundaries are also examined.

Original language	English
Pages (from-to)	2053-2056
Number of pages	4
Journal	journal of the physical society of japan
Volume	73
Issue number	8
DOIs	https://doi.org/10.1143/JPSJ.73.2053
Publication status	Published - 2004 Aug 1
Externally published	Yes

Keywords

Charge fluctuation
Extended Hubbard model
Organic conductors
Random phase approximation

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.73.2053

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abstract = "Superconductivity close to charge ordering in quasi-two-dimensional 3/4-filled organic compounds is investigated for the θ-type structure. The effect of spin and charge fluctuations is calculated within random phase approximation for a relevant extended Hubbard model with both on-site (U) and intersite (V) Coulomb interactions on an anisotropic triangular lattice. It is found that both spin and charge fluctuations induce superconductivity with extended s-wave singlet pairing, which is similar to the dxy pairing state in the square lattice. In the vicinity of charge-density-wave instability, f-wave triplet pairing is also stable due to the effect of nearest-neighbor Coulomb interaction. The temperature dependences of superconductivity and charge-density-wave phase boundaries are also examined.",

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AU - Tanaka, Yasuhiro

AU - Yanase, Youichi

AU - Ogata, Masao

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N2 - Superconductivity close to charge ordering in quasi-two-dimensional 3/4-filled organic compounds is investigated for the θ-type structure. The effect of spin and charge fluctuations is calculated within random phase approximation for a relevant extended Hubbard model with both on-site (U) and intersite (V) Coulomb interactions on an anisotropic triangular lattice. It is found that both spin and charge fluctuations induce superconductivity with extended s-wave singlet pairing, which is similar to the dxy pairing state in the square lattice. In the vicinity of charge-density-wave instability, f-wave triplet pairing is also stable due to the effect of nearest-neighbor Coulomb interaction. The temperature dependences of superconductivity and charge-density-wave phase boundaries are also examined.

AB - Superconductivity close to charge ordering in quasi-two-dimensional 3/4-filled organic compounds is investigated for the θ-type structure. The effect of spin and charge fluctuations is calculated within random phase approximation for a relevant extended Hubbard model with both on-site (U) and intersite (V) Coulomb interactions on an anisotropic triangular lattice. It is found that both spin and charge fluctuations induce superconductivity with extended s-wave singlet pairing, which is similar to the dxy pairing state in the square lattice. In the vicinity of charge-density-wave instability, f-wave triplet pairing is also stable due to the effect of nearest-neighbor Coulomb interaction. The temperature dependences of superconductivity and charge-density-wave phase boundaries are also examined.

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KW - Random phase approximation

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Superconductivity due to charge fluctuation in θ-type organic conductors

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Keywords

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