Role of spin-orbit coupling on the spin triplet pairing in Na xCoO2·yH2O: I. d-vector under zero magnetic field

Youichi Yanase*, Masahito Mochizuki, Masao Ogata

*この研究の対応する著者

研究成果: Article査読

17 被引用数 (Scopus)

抄録

The d-vector in possibile spin triplet superconductor Na xCoO2·yH2O is microscopically investigated on the basis of the multi-orbital Hubbard model including the atomic spin-orbit coupling. As a result of the perturbation theory, we obtain the stable spin triplet superconductivity where the p-wave and f-wave states can be stabilized. If we neglect the spin-orbit coupling, superconducting state has 6-fold (3-fold) degeneracy in the p-wave (f-wave) state. This degeneracy is lifted by the spin-orbit coupling. We determine the d-vector within the linearlized Dyson-Gorkov equation. It is shown that the d-vector is always along the plane when the pairing symmetry is p-wave, while it depends on the parameters in case of the f-wave state. The lifting of degeneracy is significant in the p-wave state while it is very small in the f-wave state. This is because the first order term with respect to the spin-orbit coupling is effective in the former case, while it is ineffective in the latter case. The consistency of these results with NMR and μSR measurements are discussed.

本文言語English
ページ(範囲)2568-2578
ページ数11
ジャーナルjournal of the physical society of japan
74
9
DOI
出版ステータスPublished - 2005 9
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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「Role of spin-orbit coupling on the spin triplet pairing in Na <sub>x</sub>CoO<sub>2</sub>·yH<sub>2</sub>O: I. d-vector under zero magnetic field」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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