Nonmagnetic Impurity Effects in MgB_2(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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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.
社団法人日本物理学会の論文
2004-08-15