First order superconducting phase transition in CeCoIn$_5$

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dc.creatorBianchi, A.
dc.creatorMovshovich, R.
dc.creatorOeschler, N.
dc.creatorGegenwart, P.
dc.creatorSteglich, F.
dc.creatorThompson, J. D.
dc.creatorPagliuso, P. G.
dc.creatorSarrao, J. L.
dc.date2002-03-14
dc.date.accessioned2026-07-07T12:44:15Z
dc.date.available2026-07-07T12:44:15Z
dc.descriptionWe investigated the magnetic field dependence of the superconducting phase transition in heavy fermion CeCoIn_5 (T_c = 2.3 K) using specific heat, magneto-caloric effect, and thermal expansion measurements. The superconducting transition becomes first order when the magnetic field is oriented along the 001 crystallographic direction with a strength greater that 4.7 T, and transition temperature below T_0 ~ 0.31 T_c. The change from second order at lower fields is reflected in strong sharpening of both specific heat and thermal expansion anomalies associated with the phase transition, a strong magnetocaloric effect, and a step-like change in the sample volume. The first order superconducting phase transition in CeCoIn_5 is caused by Pauli limiting in type-II superconductors, and was predicted theoretically in the mid 1960s. We do not see evidence for the inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state (predicted by an alternative theory also dating back to mid-60's) in CeCoIn_5 with field H || [001].
dc.description5 pages, includes three figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0203310
dc.identifierhttp://arxiv.org/abs/cond-mat/0203310
dc.identifierPhys.Rev.Lett.89:137002,2002
dc.identifierdoi:10.1103/PhysRevLett.89.137002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220704
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleFirst order superconducting phase transition in CeCoIn$_5$
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