Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting $\beta$-Pyrochlore KOs$_2$O$_6$

Microwave penetration depth $λ$ 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 $λ (T)$ . Below the second transition at $T_{p} \sim 8$ K, the superfluid density shows a step-like change with a suppression of effective critical temperature $T_{c}$ . 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 $T_{p}$ .

Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting $β$ -Pyrochlore KOs $_{2}$ O $_{6}$

文献摘要

讨论

讲解博客

AI智能校验

Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting $β$ -Pyrochlore KOs $_{2}$ O $_{6}$

文献摘要

讨论

讲解博客

AI智能校验

Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting ββ-Pyrochlore KOs22​O66​

文献摘要

讨论

|讲解博客

|AI智能校验

Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting ββ-Pyrochlore KOs22​O66​

文献摘要

讨论

|讲解博客

|AI智能校验

Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting $β$ -Pyrochlore KOs $_{2}$ O $_{6}$

讲解博客

AI智能校验

Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting $β$ -Pyrochlore KOs $_{2}$ O $_{6}$

讲解博客

AI智能校验