Phonon softening in Nax Co O2·y H2 O: Implications for the Fermi surface topology and the superconducting state

J. P. Rueff, M. Calandra, M. D'Astuto, Ph Leininger, A. Shukla, A. Bosak, M. Krisch, H. Ishii, Y. Cai, P. Badica, T. Sasaki, K. Yamada, K. Togano

研究成果: Article査読

20 被引用数 (Scopus)

抄録

In this work we investigate the relevance of phonons for the superconductivity in Na0.35 Co O2·1.3 H2 O. We measure phonon dispersion in this material as well as in the nonhydrated parent compound Na0.7 Co O2 by inelastic x-ray scattering. The measured phonon dispersion along the Γ-M direction shows a marked softening of Co-related optical phonon branches close to the Brillouin zone boundary, with hole doping. The phonon spectra, dispersion, and softening of Co-vibration modes are well reproduced by first-principles calculations. The critical temperature estimated from a phonon-mediated mechanism is much lower than the measured one, suggesting a nonconventional superconducting state in this material.

本文言語English
論文番号020504
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
74
2
DOI
出版ステータスPublished - 2006

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

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