Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in CeCoIn5

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

2003-04-18

arxiv.org/abs/cond-mat/0304420v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, submitted to Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.91.187004

We report specific heat measurements of the heavy fermion superconductor CeCoIn5 in the vicinity of the superconducting critical field H_{c2}, with magnetic field 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 field above 10 T for H || [110] and H || [100]. In the same range of magnetic field 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 FFLO state occupying a smaller part of the phase diagram.

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