Possible Fulde-Ferrell-Larkin-Ovchinnikov superconducting state in CeCoIn5 -: art. no. 187004
Possible Fulde-Ferrell-Larkin-Ovchinnikov superconducting state in CeCoIn5 -: art. no. 187004
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DOI：
10.1103/physrevlett.91.187004
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发表时间：
2003-10-31
影响因子：
8.6
通讯作者：
Sarrao, JL
中科院分区：
文献类型：
--
作者：
Bianchi, A;Movshovich, R;Sarrao, JL
本文报道了重费米子超导体CeCoIn5在超导临界场H-c2附近、[110]、[100]和[001]方向磁场下的比热测量，温度低至50mK。对于10T以上的磁场，H平行于[110]，H平行于[100]，超导相变由二级变为一级。在相同的磁场范围内，我们观察到超导态内的第二比热反常。我们将这一反常现象解释为Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)非均匀超导态的特征。对于H平行于[001]，我们得到了类似的结果，FFLO态在相图中占据了较小的一部分。
We report specific heat measurements of the heavy fermion superconductor CeCoIn5 in the vicinity of the superconducting critical field H-c2, with magnetic fields in the [110], [100], and [001] directions, and at temperatures down to 50 mK. The superconducting phase transition changes from second to first order for fields above 10 T for Hparallel to[110] and Hparallel to[100]. In the same range of magnetic fields, we observe a second specific heat anomaly within the superconducting state. We interpret this anomaly as a signature of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) inhomogeneous superconducting state. We obtain similar results for Hparallel to[001], with the FFLO state occupying a smaller part of the phase diagram.