Effects of rattling phonons on the dynamics of quasiparticle excitation in the β-pyrochlore KOs2O6 Superconductor

Y. Shimono, T. Shibauchi, Y. Kasahara, T. Kato, K. Hashimoto, Y. Matsuda, J. Yamaura, Y. Nagao, Z. Hiroi

研究成果: Article査読

29 被引用数 (Scopus)

抄録

Microwave penetration depth λ and surface resistance at 27 GHz are measured in high quality crystals of KOs2O6. Firm evidence for fully gapped superconductivity is provided from λ(T). Below the second transition at Tp∼8K, the superfluid density shows a steplike change with a suppression of effective critical temperature Tc. Concurrently, the extracted quasiparticle scattering time shows a steep enhancement, indicating a strong coupling between the anomalous rattling motion of K ions and quasiparticles. The results imply that the rattling phonons help to enhance superconductivity, and that K sites freeze to an ordered state with long quasiparticle mean free path below Tp.

本文言語English
論文番号257004
ジャーナルPhysical review letters
98
25
DOI
出版ステータスPublished - 2007 6月 22
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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