Low-temperature specific heat of the heavy-fermion superconductor PrOs4Sb12.
Low-temperature specific heat of the heavy-fermion superconductor PrOs4Sb12.
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DOI：
10.1103/physrevlett.90.057001
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发表时间：
2002-07
影响因子：
8.6
通讯作者：
R. Vollmer;A. Faisst;C. Pfleiderer;H. v. Löhneysen;E. Bauer;P. Ho;V. Zapf;M. Maple
中科院分区：
文献类型：
--
作者：
R. Vollmer;A. Faisst;C. Pfleiderer;H. v. Löhneysen;E. Bauer;P. Ho;V. Zapf;M. Maple
本文报道了第一个Pr基重费米子超导体Pr（Os_4Sb_（12））单晶的比热C与磁场的关系。C在低温下的变化和由C推断的磁相图、电阻率和磁化强度提供了双重基态的令人信服的证据。两个不同的超导异常C表明一个非常规的超导状态，其中分裂可能来自于基态简并的弱提升。结合起来，这将Pr（Os 4Sb 12）鉴定为四极配对的强有力竞争者，即，既不是电子-声子也不是磁介导的超导性。
We report the magnetic field dependence of the specific-heat C of single crystals of the first Pr-based heavy-fermion superconductor Pr(Os4Sb12. The variation of C at low temperature and the magnetic phase diagram inferred from C, the resistivity and magnetization provide compelling evidence of a doublet ground state. Two distinct superconducting anomalies in C indicate an unconventional superconducting state, where the splitting may arise from a weak lifting of the ground state degeneracy. In combination this identifies Pr(Os4Sb12 as a strong contender for quadrupolar pairing, i.e., superconductivity that is neither electron-phonon nor magnetically mediated.