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

Hiroshi Watanabe*, Tomonori Shirakawa, Seiji Yunoki

*この研究の対応する著者

研究成果: Article査読

2 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1848-1851
ページ数4
ジャーナルJournal of the Korean Physical Society
62
12
DOI
出版ステータスPublished - 2013 7月
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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