Nonmagnetic impurity effects in MgB$_{2}$

Details Nonmagnetic impurity effects in MgB$_{2}$ Nonmagnetic impurity effects in MgB$_{2}$

2004-01-22

arxiv.org/abs/cond-mat/0401410v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1143/JPSJ.73.2239

We study nonmagnetic impurity effects in MgB$_{2}$ using the quasiclassical equations of superconductivity for a weak-coupling two-band model. Parameters in the model are fixed so as to reproduce experiments on MgB$_{2}$ as closely as possible. The quasiparticle density of states and the specific heat are calculated for various values of the interband impurity scattering. The density of states changes gradually from a two-gap structure into the conventional single-gap structure as the interband scattering increases. It is found that the excitation threshold is not a monotonic function of the interband scattering. Calculated results for the specific heat are in good agreements with experiments on samples after irradiation.

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