Variational Monte Carlo study of pairing symmetry in Sr2RuO4

Shogo Fujita, Tsutomu Watanabe, Seiichiro Onari, Hisatoshi Yokoyama, Yukio Tanaka, Jun ichiro Inoue

Research output: Contribution to journalArticle

Abstract

With a mind to superconductivity (SC) arising in Sr2RuO4, we study a Hubbard model on square lattice including second-neighbor hopping t′, using an optimization variational Monte Carlo method. As a pairing state, we have chosen dx2 - y2 (d) wave for singlet and px (p)-wave for triplet pairing state. In the trial wave functions, a doublon-holon binding effect is introduced in addition to the onsite Gutzwiller projection. By calculating condensation energies of the SC states, we found that when t′ = -0.4t, the d-wave state is stabilized against the normal state for 0.6 < n < 1. On the other hand, p-wave state is never stabilized in this regime. Based on this result, it is difficult to understand a spin-triplet state simply from the single-band Hubbard model with onsite Coulomb interaction.

Original languageEnglish
Pages (from-to)134-137
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume463-465
Issue numberSUPPL.
DOIs
Publication statusPublished - Oct 1 2007

Keywords

  • Hubbard model
  • Unconventional superconductor
  • Variational Monte Carlo

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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    Fujita, S., Watanabe, T., Onari, S., Yokoyama, H., Tanaka, Y., & Inoue, J. I. (2007). Variational Monte Carlo study of pairing symmetry in Sr2RuO4. Physica C: Superconductivity and its applications, 463-465(SUPPL.), 134-137. https://doi.org/10.1016/j.physc.2006.12.026