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

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

2003-02-04

arxiv.org/abs/cond-mat/0302089v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure

Scientific paper

10.1103/PhysRevB.68.052507

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.

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