Anomaly in the heat capacity of Kondo superconductors

Details Anomaly in the heat capacity of Kondo superconductors Anomaly in the heat capacity of Kondo superconductors

2008-11-09

arxiv.org/abs/0811.1340v2

Phys. Rev. B 79, 012507 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.79.012507

Using numerical renormalization group we study thermodynamic properties of a magnetic impurity described by the Anderson impurity model in a superconducting host material described by the BCS Hamiltonian. When the Kondo temperature in the normal state, T_K, is comparable to the critical temperature of the superconducting transition, T_c, the magnetic doublet state may become degenerate with the Kondo singlet state, leading to a ln3 peak in the temperature dependence of the impurity contribution to the entropy. This entropy increase translates into an anomalous feature in the heat capacity which might have already been experimentally observed.

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