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, and Y. Matsuda
Phys. Rev. Lett. 94, 047602 – Published 2 February 2005

Abstract

We present a In115 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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  • Received 27 May 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.047602

©2005 American Physical Society

Authors & Affiliations

K. Kakuyanagi1, M. Saitoh1, K. Kumagai1, S. Takashima2, M. Nohara2, H. Takagi2, and Y. Matsuda3

  • 1Division of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • 2Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 3Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan, and Department of Physics, Kyoto University, Kyoto 606-8502, Japan

Comments & Replies

Kakuyanagi, Kumagai, and Matsuda Reply:

K. Kakuyanagi, K. Kumagai, and Y. Matsuda
Phys. Rev. Lett. 101, 039702 (2008)

Comment on “Texture in the Superconducting Order Parameter of CeCoIn5 Revealed by Nuclear Magnetic Resonance”

V. F. Mitrović, G. Koutroulakis, M. Klanjšek, M. Horvatić, C. Berthier, G. Knebel, G. Lapertot, and J. Flouquet
Phys. Rev. Lett. 101, 039701 (2008)

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Vol. 94, Iss. 4 — 4 February 2005

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