Antiferromagnetism and pairing symmetries in two-dimensional t-J model

Tsutomu Watanabe, Hisatoshi Yokoyama, Kenji Kobayashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

To elucidate systematically the interplay between antiferromagnetism (AF) and superconductivity (SC) in High-Tc cuprates, we study the effect of the long-range transfers, t′ and t″, by applying a variational Monte Carlo method to a t-J model. In the trial wave function, coexistence of SC and AF phases and contribution of long-range Cooper pairs, namely the higher harmonic components of the SC gap, are considered. Our result exhibits marked electron-hole asymmetry; for the hole-(electron-)doped case, the SC state is very stable (unstable), while the AF state is irrelevant (predominant). The coexisting phase always appears in the under-doped region, both in the hole-doped and electron-doped cases. Furthermore, the optimized long-range pairing components successfully yield the asymmetry of the gap form observed in the hole-doped and electron-doped cuprates.

Original languageEnglish
Pages (from-to)S106-S108
JournalPhysica C: Superconductivity and its applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec

Keywords

  • Extended t-J model
  • High-T cuprate
  • 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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