A novel superconductivity in Ir oxides with a large spin-orbit coupling

Hiroshi Watanabe, Tomonori Shirakawa, Seiji Yunoki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Motivated by novel 5d-electron systems such as Sr2IrO4 and Ba2IrO4, we study the ground state of a three-orbital Hubbard model with a spin-orbit coupling by using a variational Monte Carlo method. The obtained ground-state phase diagram reveals that an antiferromagnetic state, stable at around the electron density n = 5, is destabilized by carrier doping and that the ground state becomes superconducting. Similar to high-T c cuprates, a large asymmetry of the phase diagram between electron doping (n > 5) and hole doping (n <5) is also found, which can be understood as the band structure effect. Due to the large spin-orbit coupling which entangles spin and orbital degrees of freedom, the pseudospin becomes a good quantum number, and the superconductivity found here is characterized by the dx2-y2-wave "pseudospin singlet" pairing.

Original languageEnglish
Pages (from-to)1848-1851
Number of pages4
JournalJournal of the Korean Physical Society
Volume62
Issue number12
DOIs
Publication statusPublished - 2013 Jul
Externally publishedYes

Keywords

  • J = 1/2
  • Pseudospin-singlet superconductivity
  • Spin-orbit coupling
  • SrIrO

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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