Evolution of crystalline electric field effects, superconductivity, and heavy-fermion behavior in the specific heat of Pr(Os1-xRux)4Sb12 -: art. no. 064508

被引：31

作者：

Frederick, NA ^{[1
]}

Sayles, TA

Maple, MB

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Inst Pure & Appl Phys Sci, La Jolla, CA 92093 USA

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.71.064508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Specific heat C(T) measurements were made on single crystals of the superconducting filled skutterudite series Pr(Os1-xRux)(4)Sb-12 down to 0.6 K. Crystalline electric field fits in the normal state produced parameters which were in agreement with previous measurements. Bulk superconductivity was observed for all values of the Ru concentration x with transition temperatures consistent with previous experiments, confirming a minimum in T-c at x=0.6. The C(T) data below T-c appear to be more consistent with power-law behavior for x=0 (PrOs4Sb12), and with exponential behavior for 0.05 <= x <= 0.2. An enhanced electronic specific heat coefficient gamma was observed for x <= 0.4, further supporting x similar or equal to 0.6 as a critical concentration where the physical properties abruptly change. Significant enhancement of Delta C/T-c above the weak-coupling value was observed only for x=0 and 0.05.

引用

页数：8

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