Competition and coexistence of antiferromagnetism and superconductivity in the Hubbard model

Kenji Kobayashi; Tsutomu Watanabe; Hisatoshi Yokoyama

doi:10.1016/j.physc.2009.10.058

Competition and coexistence of antiferromagnetism and superconductivity in the Hubbard model

Kenji Kobayashi, Tsutomu Watanabe, Hisatoshi Yokoyama

SCI - Physics

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

2 Citations (Scopus)

Abstract

The interplay between antiferromagnetism (AF) and superconductivity (SC) in cuprate is studied for the two-dimensional Hubbard model with a diagonal transfer t′, using a variational Monte Carlo method. Optimizing an improved wave-function for strongly correlated values of U/t, we construct a phase diagram. It is found that the stable state is sensitive to the value of model parameters: For t′/t ≳ -0.15 a coexisting state is realized, whose range of doping rate extends as t′/t increases. In contrast, for t′/t = -0.3, AF and SC states are mutually exclusive, and the area of pure AF shrinks as U/t increases.

Original language	English
Pages (from-to)	S947-S948
Journal	Physica C: Superconductivity and its applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.10.058
Publication status	Published - 2010 Dec

Keywords

Cuprate
Hubbard model
Superconductivity
Variational Monte Carlo method

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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AU - Kobayashi, Kenji

AU - Watanabe, Tsutomu

AU - Yokoyama, Hisatoshi

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Y1 - 2010/12

N2 - The interplay between antiferromagnetism (AF) and superconductivity (SC) in cuprate is studied for the two-dimensional Hubbard model with a diagonal transfer t′, using a variational Monte Carlo method. Optimizing an improved wave-function for strongly correlated values of U/t, we construct a phase diagram. It is found that the stable state is sensitive to the value of model parameters: For t′/t ≳ -0.15 a coexisting state is realized, whose range of doping rate extends as t′/t increases. In contrast, for t′/t = -0.3, AF and SC states are mutually exclusive, and the area of pure AF shrinks as U/t increases.

AB - The interplay between antiferromagnetism (AF) and superconductivity (SC) in cuprate is studied for the two-dimensional Hubbard model with a diagonal transfer t′, using a variational Monte Carlo method. Optimizing an improved wave-function for strongly correlated values of U/t, we construct a phase diagram. It is found that the stable state is sensitive to the value of model parameters: For t′/t ≳ -0.15 a coexisting state is realized, whose range of doping rate extends as t′/t increases. In contrast, for t′/t = -0.3, AF and SC states are mutually exclusive, and the area of pure AF shrinks as U/t increases.

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KW - Hubbard model

KW - Superconductivity

KW - Variational Monte Carlo method

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Competition and coexistence of antiferromagnetism and superconductivity in the Hubbard model

Abstract

Keywords

ASJC Scopus subject areas

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