Anomaly in the heat capacity of Kondo superconductors

Abstract

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.

arXiv comment4 pages, 3 figures

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• The Ohmic two-state system from the perspective of the interacting resonant level model: Thermodynamics and transient dynamics
• On the origin of power-laws in equilibrium
• Numerical renormalization group calculation of impurity internal energy and specific heat of quantum impurity models
• Thermodynamic anomalies in the presence of dissipation: from the free particle to the harmonic oscillator
• Reentrant classicality of a damped system
• Anomalies in the specific heat of a free damped particle: The role of the cutoff in the spectral density of the coupling