Ferromagnetic fluctuation and superconductivity in Na 0.35CoO2·1.3H2O: FLEX study of multi-orbital Hubbard model

Masahito Mochizuki, Youichi Yanase, Masao Ogata

研究成果: Article

1 引用 (Scopus)


Spin and charge fluctuations and superconductivity in Na0.35CoO2·1. 3H2O are studied based on a multi-orbital Hubbard model. By applying the fluctuation exchange (FLEX) approximation, we show that the Hund's-rule coupling between the Co t2g orbitals causes ferromagnetic spin fluctuation. Triplet pairing is favored by this ferromagnetic fluctuation on the hole-pocket band. We propose that, in Na0.35CoO2·1.3H2O, Co t2g orbitals and inter-orbital Hund's-rule coupling play important roles on the triplet pairing, and this compound can be a first example of the triplet superconductor mediated by inter-orbital interaction-induced ferromagnetic fluctuation.

ジャーナルPhysica B: Condensed Matter
発行部数SPEC. ISS.
出版物ステータスPublished - 2005 4 30

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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