Texture in the superconducting order parameter of CeCoIn5 revealed by nuclear magnetic resonance |
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Authors: | Kakuyanagi K Saitoh M Kumagai K Takashima S Nohara M Takagi H Matsuda Y |
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Institution: | Division of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan. |
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Abstract: | 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. |
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