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Field Evolution of Coexisting Superconducting and Magnetic Orders in CeCoIn5

G. Koutroulakis, M. D. Stewart, Jr., V. F. Mitrović, M. Horvatić, C. Berthier, G. Lapertot, and J. Flouquet
Phys. Rev. Lett. 104, 087001 – Published 23 February 2010
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We present nuclear magnetic resonance (NMR) measurements on the three distinct In sites of CeCoIn5 with a magnetic field applied in the [100] direction. We identify the microscopic nature of the long range magnetic order (LRO) stabilized at low temperatures in fields above 10.2 T while still in the superconducting (SC) state. We infer that the ordered moment is oriented along the c^ axis and map its field evolution. The study of the field dependence of the NMR shift for the different In sites indicates that the LRO likely coexists with a modulated SC phase, possibly that predicted by Fulde, Ferrell, Larkin, and Ovchinnikov. Furthermore, we discern a field region dominated by strong spin fluctuations where static LRO is absent and propose a revised phase diagram.

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  • Received 28 October 2009


©2010 American Physical Society


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Unlikely partners

Published 26 February 2010

A new phase of coexisting superconductivity and magnetic order is discovered in CeCoIn5.

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Authors & Affiliations

G. Koutroulakis1, M. D. Stewart, Jr.1, V. F. Mitrović1, M. Horvatić2, C. Berthier2, G. Lapertot3, and J. Flouquet3

  • 1Department of Physics, Brown University, Providence, Rhode Island 02912, USA
  • 2Laboratoire National des Champs Magnétiques Intenses, CNRS, B.P. 166, 38042 Grenoble Cedex 9, France
  • 3CEA, INAC, SPSMS, CEA Grenoble, 38054 Grenoble Cedex 9, France

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Vol. 104, Iss. 8 — 26 February 2010

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