High-field ordered and superconducting phases in the heavy-fermion compound PrOs 4 Sb 12
High-field ordered and superconducting phases in the heavy-fermion compound PrOs 4 Sb 12
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重费米子化合物 PrOs 4 Sb 12 中的高场有序和超导相
DOI：
10.1103/physrevb.67.180508
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发表时间：
2003
影响因子：
3.7
通讯作者：
A. Lacerda
中科院分区：
文献类型：
--
作者：
P. Ho;N. A. Frederick;V. Zapf;E. Bauer;T. Do;M. Maple;A. Christianson;A. Lacerda
填充的Skutterudite化合物ProS4Sb12是Pr基重费米子超导体的第一个例子，它的超导电性为Tc∼1.85K，有效质量m*∼50me，其中Me是自由电子质量。对于4.5T以上的磁场，正常状态的电阻率、磁化强度、比热和热膨胀数据的尖锐特征表明，在高场发生了相变。这种正常状态下的高场有序相可能与结晶电场、塞曼分裂和四极有序的组合有关。本文研究了PrS4Sb12的电阻率和磁化强度随温度(350 mK~3.5K)和磁场(直到18T)的变化。数据揭示了PrS4Sb12的高场有序相的详细相界，以及超导状态下的低临界场Hc1和峰值效应的起始场。
The filled-skutterudite compound PrOs 4 Sb 1 2 , the first example of a Pr-based heavy-fermion superconductor, displays superconductivity with T c ∼1.85 K and has an effective mass m*∼50m e , where m e is the free-electron mass. For magnetic fields above 4.5 T, sharp features in the normal-state electrical resistivity, magnetization, specific-heat, and thermal-expansion data suggest the occurrence of a phase transition at high fields. This high-field ordered phase in the normal state may be associated with a combination of crystalline electric fields, Zeeman splitting, and quadrupolar ordering. We present an investigation of the electrical resistivity and magnetization of PrOs 4 Sb 1 2 as a function of temperature between 350 mK and 3.5 K and magnetic field up to 18 T. The data reveal a detailed phase boundary of the high-field ordered phase as well as the lower critical field H c 1 and the onset field of the peak effect in the superconducting state of PrOs 4 Sb 1 2 .