Superconducting state of filled-skutterudite RPt4Ge12 (R = La, Pr): 73Ge-NQR studies

被引：10

作者：

Kanetake, F. ^{[1
]}

Mukuda, H. ^{[1
]}

Kitaoka, Y. ^{[1
]}

Sugawara, H. ^{[2
]}

Magishi, K. ^{[2
]}

Itoh, K. M. ^{[3
]}

Haller, E. E. ^{[4
]}

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Osaka 5608531, Japan

[2] Univ Tokushima, Fac Integrated Arts & Sci, Tokushima 7708502, Japan

[3] Keio Univ, Dept Appl Phys & Physicoinformat, Yokohama, Kanagawa 2238522, Japan

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2010年 / 470卷

关键词：

Filled-skutterudite; RPt4Ge12; Superconductivity; NMR; NQR;

D O I：

10.1016/j.physc.2009.11.127

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report Ge-73-NQR studies on filled-skutterudite superconductors LaPt4Ge12 and PrPt4Ge12 under zero external field. In PrPt4Ge12, the measurement of the nuclear spin-lattice relaxation rate 1/T-1 has revealed a distinct coherence peak just below T-c followed by an exponential decrease well below T-c, evidencing that PrPt4Ge12 is an s-wave superconductor with the isotropic gap in a weak-coupling regime. In LaPt4Ge12, the 1/T-1 exhibits the exponential decrease well below T-c, suggesting the isotropic s-wave superconductivity. Even though Ge-73-NQR-1/T-1 in LaPt4Ge12 has been measured under zero field, its coherence peak was absent, which contrasts with the result in Pr-compound. This may point to a possible anisotropy in the Fermi surface and/or some damping effect of quasiparticles in association with electron-phonon interactions. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：S703 / S704

页数：2