## 抄録

Based on a microscopic theoretical study, we show that novel superconductivity is induced by carrier doping in layered perovskite Ir oxides where a strong spin-orbit coupling causes an effective total angular momentum J_{eff}=1/2 Mott insulator. Using a variational Monte Carlo method, we find an unconventional superconducting state in the ground state phase diagram of a t_{2g} three-orbital Hubbard model on the square lattice. This superconducting state is characterized by a d_{x2-y2}-wave "pseudospin singlet" formed by the J_{eff}=1/2 Kramers doublet, which thus contains interorbital as well as both singlet and triplet components of t_{2g} electrons. The superconducting state is found stable only by electron doping, but not by hole doping, for the case of carrier doped Sr_{2}IrO_{4}. We also study an effective single-orbital Hubbard model to discuss the similarities to high-T_{c} cuprate superconductors and the multiorbital effects.

本文言語 | English |
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論文番号 | 027002 |

ジャーナル | Physical Review Letters |

巻 | 110 |

号 | 2 |

DOI | |

出版ステータス | Published - 2013 1月 9 |

外部発表 | はい |

## ASJC Scopus subject areas

- 物理学および天文学（全般）

## フィンガープリント

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