Superconductivity and Phase Separation in Extended Hubbard Model

K. Kobayashi, H. Yokoyama

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


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 languageEnglish
Pages (from-to)22-25
Number of pages4
JournalPhysics Procedia
Publication statusPublished - 2014
Event26th International Symposium on Superconductivity, ISS 2013 - Tokyo, Japan
Duration: 2013 Nov 182013 Nov 20


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


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