An analytical result for renormalization of the jump of the heat capacity Delta C/C_N by the anisotropy of the order parameter is derived in the framework of the model proposed by Haas and Maki [Phys. Rev. B 65, 020502(R) (2001)], for both prolate and oblate anisotropy. The graph of Delta C/C_N versus the ratio of the gaps on the equator and the pole, Delta_e/Delta_p, of the Fermi surface allows a direct determination of the gap anisotropy parameter Delta_e/Delta_p using data from specific heat measurements.
@article{arxiv.cond-mat/0204545,
title = {Comment on "Anisotropic s-wave superconductivity in MgB_2"},
author = {Todor M. Mishonov and Evgeni S. Penev and Joseph O. Indekeu},
journal= {arXiv preprint arXiv:cond-mat/0204545},
year = {2009}
}
Comments
1 page, 1 figure, REVTeX 4, to be submitted to Phys. Rev. B