NMR observation of rattling phonons in the pyrochlore superconductor KOs2O6

被引：54

作者：

Yoshida, M. ^{[1
]}

Arai, K. ^{[1
]}

Kaido, R. ^{[1
]}

Takigawa, M. ^{[1
]}

Yonezawa, S. ^{[1
]}

Muraoka, Y. ^{[1
]}

Hiroi, Z. ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.98.197002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 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 T-c. Suppression of the Hebel-Slichter peak in the relaxation rate at the O sites below T-c also indicates strong electron-phonon coupling.

引用

页数：4

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