Competition and coexistence of antiferromagnetism and superconductivity in the Hubbard model

Kenji Kobayashi, Tsutomu Watanabe, Hisatoshi Yokoyama

研究成果: Article査読

2 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)S947-S948
ジャーナルPhysica C: Superconductivity and its applications
470
SUPPL.1
DOI
出版ステータスPublished - 2010 12月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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