Superconductivity and Phase Separation in Extended Hubbard Model

K. Kobayashi; Hisatoshi Yokoyama

doi:10.1016/j.phpro.2014.09.006

Superconductivity and Phase Separation in Extended Hubbard Model

K. Kobayashi, Hisatoshi Yokoyama

SCI - Physics

Research output: Contribution to journal › Conference article › peer-review

6 Citations (Scopus)

Abstract

Having cuprate superconductors in mind, we study the effect of intersite repulsion on antiferromagnetism (AF) and superconductivity (SC) in an extended Hubbard model on a square lattice with a diagonal transfer t′, using a variational Monte Carlo method. In the trial wave function, essential factors for Mott physics and band renormalization are included. It is found by introducing small intersite repulsion that the SC dome shrinks but AF is almost unchanged for U/t=10 (likely for cuprates). Meanwhile, instable range of doping rate (δ) toward phase separation becomes narrower. This instable range of δ almost coincides with the range of a finite AF gap, especially in good coincidence for t′/t=0.

Original language	English
Pages (from-to)	22-25
Number of pages	4
Journal	Physics Procedia
Volume	58
DOIs	https://doi.org/10.1016/j.phpro.2014.09.006
Publication status	Published - 2014 Jan 1
Event	26th International Symposium on Superconductivity, ISS 2013 - Tokyo, Japan Duration: 2013 Nov 18 → 2013 Nov 20

Keywords

Hubbard model
Mott physics
Superconductivity
cuprate
repulsive intersite interaction
variational Monte Carlo method

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Superconductivity and Phase Separation in Extended Hubbard Model",

abstract = "Having cuprate superconductors in mind, we study the effect of intersite repulsion on antiferromagnetism (AF) and superconductivity (SC) in an extended Hubbard model on a square lattice with a diagonal transfer t′, using a variational Monte Carlo method. In the trial wave function, essential factors for Mott physics and band renormalization are included. It is found by introducing small intersite repulsion that the SC dome shrinks but AF is almost unchanged for U/t=10 (likely for cuprates). Meanwhile, instable range of doping rate (δ) toward phase separation becomes narrower. This instable range of δ almost coincides with the range of a finite AF gap, especially in good coincidence for t′/t=0.",

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AU - Kobayashi, K.

AU - Yokoyama, Hisatoshi

PY - 2014/1/1

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N2 - Having cuprate superconductors in mind, we study the effect of intersite repulsion on antiferromagnetism (AF) and superconductivity (SC) in an extended Hubbard model on a square lattice with a diagonal transfer t′, using a variational Monte Carlo method. In the trial wave function, essential factors for Mott physics and band renormalization are included. It is found by introducing small intersite repulsion that the SC dome shrinks but AF is almost unchanged for U/t=10 (likely for cuprates). Meanwhile, instable range of doping rate (δ) toward phase separation becomes narrower. This instable range of δ almost coincides with the range of a finite AF gap, especially in good coincidence for t′/t=0.

AB - Having cuprate superconductors in mind, we study the effect of intersite repulsion on antiferromagnetism (AF) and superconductivity (SC) in an extended Hubbard model on a square lattice with a diagonal transfer t′, using a variational Monte Carlo method. In the trial wave function, essential factors for Mott physics and band renormalization are included. It is found by introducing small intersite repulsion that the SC dome shrinks but AF is almost unchanged for U/t=10 (likely for cuprates). Meanwhile, instable range of doping rate (δ) toward phase separation becomes narrower. This instable range of δ almost coincides with the range of a finite AF gap, especially in good coincidence for t′/t=0.

KW - Hubbard model

KW - Mott physics

KW - Superconductivity

KW - cuprate

KW - repulsive intersite interaction

KW - variational Monte Carlo method

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