Effects of Pauli paramagnetism on thermodynamic quantities in a vortex state, such as the specific heat C and magnetization M, are studied using the quasiclassical Eilenberger formalism. We demonstrate that with an increase of paramagnetic depairing effect, the sigh of the curvature of the field dependence of C changes from negative to positive, and that the Maki parameter κ2 becomes an increasing function of temperature. Our results provide a natural explanation for the unusual field dependence of C seen in CeCoIn5 in terms of the paramagnetic effect.
@article{arxiv.cond-mat/0503265,
title = {Mixed-State Thermodynamics of Superconductors with Moderately Large Paramagnetic Effects},
author = {H. Adachi and M. Ichioka and K. Machida},
journal= {arXiv preprint arXiv:cond-mat/0503265},
year = {2009}
}