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 2005
Externally publishedYes

Fingerprint

muon spin rotation
two fluid models
tendencies
penetration
deviation
temperature dependence

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Possible anisotropic order parameter in pyrochlore superconductor KOs 2O 6 probed by muon spin rotation. / Koda, Akihiro; Higemoto, Wataru; Ohishi, Kazuki; Saha, Shanta R.; Kadono, Ryosuke; Yonezawa, Shigeki; Muraoka, Yuji; Hiroi, Zenji.

In: Journal of the Physical Society of Japan, Vol. 74, No. 6, 06.2005, p. 1678-1681.

Research output: Contribution to journalArticle

Koda, Akihiro ; Higemoto, Wataru ; Ohishi, Kazuki ; Saha, Shanta R. ; Kadono, Ryosuke ; Yonezawa, Shigeki ; Muraoka, Yuji ; Hiroi, Zenji. / Possible anisotropic order parameter in pyrochlore superconductor KOs 2O 6 probed by muon spin rotation. In: Journal of the Physical Society of Japan. 2005 ; Vol. 74, No. 6. pp. 1678-1681.
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AU - Koda, Akihiro

AU - Higemoto, Wataru

AU - Ohishi, Kazuki

AU - Saha, Shanta R.

AU - Kadono, Ryosuke

AU - Yonezawa, Shigeki

AU - Muraoka, Yuji

AU - Hiroi, Zenji

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AB - 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.

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