Thermodynamical study on the heavy-fermion superconductor PrOs4Sb12:: Evidence for field-induced phase transition
Thermodynamical study on the heavy-fermion superconductor PrOs4Sb12:: Evidence for field-induced phase transition
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DOI：
10.1143/jpsj.71.2098
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发表时间：
2002-09-01
影响因子：
1.7
通讯作者：
Sato, H
中科院分区：
文献类型：
--
作者：
Aoki, Y;Namiki, T;Sato, H
本文报道了4f（2）基重费米子超导体PrOs4Sb 12的低温比热测量结果。在4.5T以上的磁场中，在正常状态下，发现了明显的异常，证明了场致有序相（FIOP）的存在。Pr核比热表明FIOP中4f磁矩的增强。利用一个麦克斯韦关系，我们得出结论，反常熵，这是预期的一个单站四极Kondo模型，不隐藏低于0.16 K在零场。我们还讨论了近似3K时Schottky异常的两种可能解释，晶场激发或杂化间隙形成。
We report measurements of low-temperature specific heat on the 4f(2)-based heavy-fermion superconductor PrOs4Sb12. In magnetic fields above 4.5T in the normal state, distinct anomalies are found which demonstrate the existence of a field-induced ordered phase (FIOP). The Pr nuclear specific heat indicates an enhancement of the 4f magnetic moment in the FIOP. Utilizing a Maxwell relation, we conclude that anomalous entropy, which is expected for a single-site quadrupole Kondo model, is not concealed below 0.16 K in zero field. We also discuss two possible interpretations of the Schottky-like anomaly at similar to3 K, i.e., a crystalline-field excitation or a hybridization gap formation.