Phys. Rev. Lett. 94, 047602 (2005) [4 pages]Texture in the Superconducting Order Parameter of CeCoIn5 Revealed by Nuclear Magnetic ResonanceReceived 27 May 2004; published 2 February 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.047602
DOI:
10.1103/PhysRevLett.94.047602
PACS:
76.60.Cq, 71.27.+a, 74.25.Dw, 74.70.Tx
See AlsoComment: V. F. Mitrović, G. Koutroulakis, M. Klanjšek, M. Horvatić, C. Berthier, G. Knebel, G. Lapertot, and J. Flouquet, Comment on “Texture in the Superconducting Order Parameter of CeCoIn5 Revealed by Nuclear Magnetic Resonance”, Phys. Rev. Lett. 101, 039701 (2008). Reply: K. Kakuyanagi, K. Kumagai, and Y. Matsuda, Kakuyanagi, Kumagai, and Matsuda Reply:, Phys. Rev. Lett. 101, 039702 (2008). |
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