NMR observation of rattling phonons in the pyrochlore superconductor KOs2O6

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

Research output: Contribution to journalArticle

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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

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nuclear relaxation
crossovers
phonons
transition temperature
retarding
low frequencies
gradients
nuclear magnetic resonance
oscillations
oxides
electric fields
ions
electrons
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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

NMR observation of rattling phonons in the pyrochlore superconductor KOs2O6. / Yoshida, M.; Arai, K.; Kaido, R.; Takigawa, M.; Yonezawa, S.; Muraoka, Yuji; Hiroi, Z.

In: Physical Review Letters, Vol. 98, No. 19, 197002, 08.05.2007.

Research output: Contribution to journalArticle

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, vol. 98, no. 19, 197002. https://doi.org/10.1103/PhysRevLett.98.197002
Yoshida, M. ; Arai, K. ; Kaido, R. ; Takigawa, M. ; Yonezawa, S. ; Muraoka, Yuji ; Hiroi, Z. / NMR observation of rattling phonons in the pyrochlore superconductor KOs2O6. In: Physical Review Letters. 2007 ; Vol. 98, No. 19.
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