Physics – Condensed Matter – Superconductivity
Scientific paper
2007-05-17
Phys. Rev. Lett. 98, 257004 (2007).
Physics
Condensed Matter
Superconductivity
5 pages, 5 figures, to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.98.257004
Microwave penetration depth $\lambda$ and surface resistance at 27 GHz are measured in high quality crystals of KOs$_2$O$_6$. Firm evidence for fully-gapped superconductivity is provided from $\lambda(T)$. Below the second transition at $T_{\rm p}\sim 8$ K, the superfluid density shows a step-like change with a suppression of effective critical temperature $T_{\rm c}$. 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 $T_{\rm p}$.
Hashimoto Katsumi
Hiroi Zenji
Kasahara Yasushi
Kato Taichi
Matsuda Yuichi
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