Ferromagnetic and triplet-pairing instabilities controlled by trigonal distortion of CoO6 octahedra in NaxCoO2· yH2O

Masahito Mochizuki, Youichi Yanase, Masao Ogata

研究成果: Article査読

33 被引用数 (Scopus)

抄録

In the recently discovered Co-oxide superconductor NaxCoO 2·yH2O, the edge-shared CoO6 octahedra are trigonally contracted along the c-axis in the CoO2-plane. We study how this CoO6 distortion affects the magnetic properties and superconductivity in this compound by analyzing the multiorbital Hubbard model using the fluctuation-exchange approximation. It is shown that through generating the trigonal crystal field, the distortion pushes the Co e′g bands up and consequently gives rise to the hole-pocket Fermi surfaces, which have been predicted in the band calculations. As the distortion increases, the hole pockets are enlarged and the ferromagnetic fluctuation as well as the pairing instability increases, which is in good agreement with recent NQR results.

本文言語English
ページ(範囲)1670-1673
ページ数4
ジャーナルjournal of the physical society of japan
74
6
DOI
出版ステータスPublished - 2005 6
外部発表はい

ASJC Scopus subject areas

  • Physics and Astronomy(all)

フィンガープリント 「Ferromagnetic and triplet-pairing instabilities controlled by trigonal distortion of CoO<sub>6</sub> octahedra in Na<sub>x</sub>CoO<sub>2</sub>· yH<sub>2</sub>O」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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