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 language | English |
|---|---|
| Article number | 197002 |
| Journal | Physical Review Letters |
| Volume | 98 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - May 8 2007 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
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 journal › Article
}
TY - JOUR
T1 - NMR observation of rattling phonons in the pyrochlore superconductor KOs2O6
AU - Yoshida, M.
AU - Arai, K.
AU - Kaido, R.
AU - Takigawa, M.
AU - Yonezawa, S.
AU - Muraoka, Yuji
AU - Hiroi, Z.
PY - 2007/5/8
Y1 - 2007/5/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=34547341208&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevLett.98.197002
DO - 10.1103/PhysRevLett.98.197002
M3 - Article
VL - 98
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 19
M1 - 197002
ER -