NMR observation of rattling phonons in the pyrochlore superconductor KOs2O6

M. Yoshida, K. Arai, R. Kaido, M. Takigawa, S. Yonezawa, Y. Muraoka, Z. Hiroi

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Abstract

We report nuclear magnetic resonance studies on the β-pyrochlore oxide superconductor KOs2O6. The nuclear relaxation at the K sites is entirely caused by fluctuations of the 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. Suppression of the Hebel-Slichter peak in the relaxation rate at the O sites below Tc also indicates strong electron-phonon coupling.

Original languageEnglish
Article number197002
JournalPhysical Review Letters
Volume98
Issue number19
DOIs
Publication statusPublished - May 8 2007
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yoshida, M., Arai, K., Kaido, R., Takigawa, M., Yonezawa, S., Muraoka, Y., & Hiroi, Z. (2007). NMR observation of rattling phonons in the pyrochlore superconductor KOs2O6. Physical Review Letters, 98(19), [197002]. https://doi.org/10.1103/PhysRevLett.98.197002