NMR Observation of Rattling Phonons in the Pyrochlore Superconductor KOs2O6

Details NMR Observation of Rattling Phonons in the Pyrochlore Superconductor KOs2O6 NMR Observation of Rattling Phonons in the Pyrochlore Superconductor KOs2O6

2006-10-27

arxiv.org/abs/cond-mat/0610760v2

Phys. Rev. Lett. 98 (2007) 197002

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.197002

We report nuclear magnetic resonance studies on the beta-pyrochlore oxide superconductor KOs2O6. The nuclear relaxation at the K sites is entirely caused by fluctuations of electric field gradient, which we ascribe to highly anharmonic low frequency oscillation (rattling) of K ions. A phenomenological analysis shows a crossover from overdamped to underdamped behavior of the rattling phonons with decreasing temperature and its sudden sharpening below the superconducting transition temperature Tc. Absence of the Hebel-Slichter peak in the relaxation rate at the O sites below Tc also indicates strong electron-phonon coupling.

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