Properties of A-15 Superconductors with Defects

Abstract
It is suggested that the large reduction of the superconducting transition temperature Tc due to defects observed experimentally in some A-15 compounds is caused by smearing of a high peak in the density of states at the Fermi level. The influence of defects on other physical properties (the magnetic susceptibility χ, the elastic modulus Cs, the structural transformation temperature Tm and the electrical resistivity ρ) is also discussed from the same point of view. We expect the anomalous temperature dependence of χ, Cs and ρ will be suppressed by defects.

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