Texture in the superconducting order parameter of CeCoIn5 revealed by nuclear magnetic resonance

K. Kakuyanagi, M. Saitoh, K. Kumagai, S. Takashima, M. Nohara, H. Takagi, Y. Matsuda

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168 Citations (Scopus)


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.

Original languageEnglish
Article number047602
JournalPhysical Review Letters
Issue number4
Publication statusPublished - Feb 4 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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