Texture in the superconducting order parameter of CeCoIn5 revealed by nuclear magnetic resonance.
Texture in the superconducting order parameter of CeCoIn5 revealed by nuclear magnetic resonance.
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DOI：
10.1103/physrevlett.94.047602
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发表时间：
2004-05
影响因子：
8.6
通讯作者：
K. Kakuyanagi;M. Saito;K. Kumagai;S. Takashina;M. Nohara;H. Takagi;Y. Matsuda
中科院分区：
文献类型：
--
作者：
K. Kakuyanagi;M. Saito;K. Kumagai;S. Takashina;M. Nohara;H. Takagi;Y. Matsuda
我们提出了一个准二维重费米子超导体CeCoIn 5的115 In NMR研究相信主机的Fulde-Ferrel-Larkin-Ovchinnikov（FFLO）状态。在上临界场附近和平行于ab平面施加的磁场下，NMR谱在T*（H）以下表现出显著的变化，这与比热和超声速度中报告的异常的位置完全一致。我们认为，我们的研究结果提供了第一个微观证据的空间调制超导序参量预期在FFLO状态的发生。核磁共振谱也暗示了涡旋核的反常电子结构。
We present a 115In NMR study of the quasi-two-dimensional heavy-fermion superconductor CeCoIn5 believed to host a Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state. In the vicinity of the upper critical field and with a magnetic field applied parallel to the ab plane, the NMR spectrum exhibits a dramatic change below T*(H) which well coincides with the position of reported anomalies in specific heat and ultrasound velocity. We argue that our results provide the first microscopic evidence for the occurrence of a spatially modulated superconducting order parameter expected in a FFLO state. The NMR spectrum also implies an anomalous electronic structure of vortex cores.