Anomalous specific heat jump in the heavy fermion superconductor CeCoIn${}_5$

Abstract

We study the anomalously large specific heat jump and its systematic change with pressure in CeCoIn${}_5$ superconductor. Starting with the general free energy functional of the superconductor for a coupled electron boson system, we derived the analytic result of the specific heat jump of the strong coupling superconductivity occurring in the coupled electron boson system. Then using the two component spin-fermion model we calculate the specific heat coefficient $C(T)/T$ both for the normal and superconducting states and show a good agreement with the experiment of CeCoIn${}_5$. Our result also clearly demonstrated that the specific heat coefficient $C(T)/T$ of a coupled electron boson system can be freely interpreted as a renormalization either of the electronic or of the bosonic degrees of freedom.

5 pages, 2 figures

References in corpus (4)

• Avoided Antiferromagnetic Order and Quantum Critical Point in CeCoIn${}_5$
• Condensation energy in strongly coupled superconductors
• Specific Heat Discontinuity in Impure Two-Band Superconductors
• Specific heat at the transition in a superconductor with fluctuating magnetic moments

Cited by in corpus (6)

• Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn_5
• Composition and field tuned magnetism and superconductivity in Nd1-xCexCoIn5
• Strong-Coupling Superconductivity in NaFe${}_{1-x}$Co${}_x$As: the Eliashberg Theory and Beyond
• Ta4CoSi: a Tantalum-rich superconductor with a honeycomb network structure
• Upper critical field of CeCoIn5
• Anomalous Paramagnetic Magnetization in Mixed State of CeCoIn${}_5$ single crystals