Competition and coexistence of antiferromagnetism and superconductivity in the Hubbard model

Kenji Kobayashi, Tsutomu Watanabe, Hisatoshi Yokoyama

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 languageEnglish
Pages (from-to)S947-S948
JournalPhysica C: Superconductivity and its applications
Issue numberSUPPL.1
Publication statusPublished - 2010 Dec


  • 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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