Specific heat at the transition in a superconductor with fluctuating magnetic moments

Abstract

In the heavy-fermion materials CeCoIn${}_5$ and UBe${}_{13}$, the superconducting order parameter is coupled to flucutating magnetization of the uncompensated part of the localized $f$-moments. We find that this coupling decreases the superconducting transition temperature and increases the jump of the specific-heat coefficient, which indicates entropy transfer from the magnetic to the superconducting degree of freedom at the transition temperature. Below the transition, we find that the magnetic fluctuations are suppressed. We discuss the relation of our results to experiments on CeCoIn${}_5$ under pressure.

arXiv comment4 pages, 1 figure

References in corpus (2)

• Anomalous NMR Magnetic Shifts in CeCoIn_5
• Intersite coupling effects in a Kondo lattice

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• Upper critical field of CeCoIn5
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• Renormalizations in unconventional superconducting states born of normal and singular Fermi-liquids