Fully gapped superconductivity and strong electron correlations in the β-pyrochlore KOs2 O6

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

Research output: Contribution to journalArticlepeer-review


To elucidate the superconducting gap structure and the influence of rattling motion on quasiparticle dynamics in the superconducting state of KOs2 O6, thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity at the lowest temperature and the temperature dependence of penetration depth strongly indicate a fully gapped superconductivity in KOs2 O6. The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron-electron inelastic scattering in the normal state. These results highlight that KOs2 O6 is unique among superconductors, which is characterized by the coexistence of fully gapped superconductivity and strong electron correlations.

Original languageEnglish
Pages (from-to)3228-3231
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Issue number12
Publication statusPublished - Dec 2008
Externally publishedYes


  • A. Oxides
  • A. Superconductors
  • D. Electrical conductivity
  • D. Superconductivity
  • D. Thermal conductivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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