Possible anisotropic order parameter in pyrochlore superconductor KOs 2O 6 probed by muon spin rotation

Akihiro Koda, Wataru Higemoto, Kazuki Ohishi, Shanta R. Saha, Ryosuke Kadono, Shigeki Yonezawa, Yuji Muraoka, Zenji Hiroi

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Magnetic penetration depth (λeff) in a pyrochlore superconductor KOs 2O 6 was studied by means of muon spin rotation (μSR). The temperature dependence of the transverse spin relaxation rate, which is proportional to λ eff -2, exhibits a considerable deviation from that expected for the empirical two-fluid model (∝ T 4), obeying a T 2 tendency. Furthermore, λ eff apparently increases with increasing applied field, suggesting the presence of nonlinear and nonlocal effects. The present result strongly suggests that the superconducting order parameter in KOs 2O 6 is anisotropic or multigapped with a small energy gap.

Original languageEnglish
Pages (from-to)1678-1681
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number6
DOIs
Publication statusPublished - Jun 1 2005
Externally publishedYes

Keywords

  • Anisotropic superconductivity
  • Flux-line lattice
  • Pyrochlore oxide
  • Strongly correlated electron
  • μSR

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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