Possible Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in CeCoIn5

A. Bianchi, R. Movshovich, C. Capan, P. G. Pagliuso, and J. L. Sarrao
Phys. Rev. Lett. 91, 187004 – Published 28 October 2003

Abstract

We report specific heat measurements of the heavy fermion superconductor CeCoIn5 in the vicinity of the superconducting critical field Hc2, with magnetic fields in the [110], [100], and [001] directions, and at temperatures down to 50 mK. The superconducting phase transition changes from second to first order for fields above 10 T for H[110] and H[100]. In the same range of magnetic fields, we observe a second specific heat anomaly within the superconducting state. We interpret this anomaly as a signature of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) inhomogeneous superconducting state. We obtain similar results for H[001], with the FFLO state occupying a smaller part of the phase diagram.

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  • Received 16 April 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.187004

©2003 American Physical Society

Authors & Affiliations

A. Bianchi1, R. Movshovich1, C. Capan1, P. G. Pagliuso2, and J. L. Sarrao1

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2Instituto de Física “Gleb Wathagin,” UNICAMP, 13083-970 Campinas, Brazil

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Issue

Vol. 91, Iss. 18 — 31 October 2003

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