Low-temperature anomalies in the specific heat of PrOs4Sb12

被引：2
作者：
Andraka, B. [1 ]
McBriarty, M. E. [1 ]
Rotundu, C. R. [2 ]
机构：
[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 02期
基金：
美国国家科学基金会;
关键词：
SPIN-LATTICE-RELAXATION; CAPACITY; BISMUTH; FIELD;
D O I：
10.1103/PhysRevB.81.024517
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The electronic specific heat of PrOs4Sb12 was measured on different single crystals at temperatures down to 40 mK using a relaxation method. All investigated crystals exhibited a broad shoulder in specific heat near 0.4 K. This anomaly seems to be related to that found previously in Sb nuclear quadrupolar resonance study and possibly in lower critical-field and penetration-depth measurements. The onset of the specific-heat anomaly shows no response to magnetic fields as large as 0.2 T. These results imply a modification of superconducting properties (and normal-state properties) rather than appearance of a new superconducting phase at low temperatures. Our measurement detects low-temperature nuclear specific heat, which we suggest might be due to nuclear quadrupolar specific heat of Pr atoms, frozen in off-center positions.
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页数：5
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