Theoretical analysis on the multi-orbital model for the superconductivity in NaxCoO2

Youichi Yanase*, Masahito Mochizuki, Masao Ogata

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We analyze the multi-orbital model which describes the electronic structure of recently discovered superconductor NaxCoO2·yH2O. The instability to the unconventional superconductivity is investigated by means of the perturbation theory. It is shown that the spin triplet superconductivity is stabilized in the wide parameter region, basically owing to the ferromagnetic spin fluctuation. In a small part of the parameter region, the d-wave superconductivity is also stabilized. We point out that the orbital degree of freedom plays an essential role for the superconductivity.

Original languageEnglish
Pages (from-to)1351-1353
Number of pages3
JournalPhysica B: Condensed Matter
Issue numberSPEC. ISS.
Publication statusPublished - 2005 Apr 30
Externally publishedYes


  • NaCoO·yHO
  • Orbital degree of freedom
  • Unconventional superconductivity

ASJC Scopus subject areas

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


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