Thermal conductivity of the pyrochlore superconductor KOs2O6: Strong electron correlations and fully gapped superconductivity

Y. Kasahara, Y. Shimono, T. Shibauchi, Y. Matsuda, S. Yonezawa, Y. Muraoka, Z. Hiroi

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51 Citations (Scopus)

Abstract

To elucidate the nature of the superconducting ground state of the geometrically frustrated pyrochlore KOs2O6 (Tc=9.6K), the thermal conductivity was measured down to low temperatures (∼Tc/100). We found that the quasiparticle mean free path is strikingly enhanced below a transition at Tp=7.8K, indicating enormous electron inelastic scattering in the normal state. In magnetic fields, the conduction at T→0K is nearly constant up to ∼0.4Hc2, in contrast with the rapid growth expected for superconductors with an anisotropic gap. This unambiguously indicates a fully gapped superconductivity, in contrast with previous studies. These results highlight that KOs2O6 is unique among superconductors with strong electron correlations.

Original languageEnglish
Article number247004
JournalPhysical Review Letters
Volume96
Issue number24
DOIs
Publication statusPublished - Jun 30 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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