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Phys Rev Lett. 2003 Oct 31;91(18):187004. Epub 2003 Oct 28.

Possible Fulde-Ferrell-Larkin-Ovchinnikov superconducting state in CeCoIn5.

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1
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Abstract

We report specific heat measurements of the heavy fermion superconductor CeCoIn5 in the vicinity of the superconducting critical field H(c2), 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 parallel [110] and H parallel [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 parallel [001], with the FFLO state occupying a smaller part of the phase diagram.

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