Magnetic fluctuation and pairing instability controlled by the CoO6 distortion in the sodium cobalt oxide

Masahito Mochizuki*, Youichi Yanase, Masao Ogata

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We study how the CoO6 distortion along the c-axis affects the magnetic properties and superconductivity in the novel Co-oxide superconductor Nax CoO2 · y H2 O 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 eg 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)875-877
ページ数3
ジャーナルPhysica B: Condensed Matter
378-380
SPEC. ISS.
DOI
出版ステータスPublished - 2006 5 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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