Internal friction in Pb-In superconductor with dislocations surrounded by impurity atoms in the magnetic field H<Hsub(k10)

The magnetic field penetration to a single-crystal supperconductor Pb-In with dislocations surrounded by impurity atoms is studied by the amplitude-dependent internal friction method. The magnetic field H is found to penetrate a single-crystal containing such imperfection at H<Hsub(k10). The dependence of dislocation internal friction delta on H takes the form of a curve with a maximum near Hsub(k10). The effect of temperature and deformation amplitude on the dependence delta (H) is studied. The result suggest that the critical superconducting parameters vary within the crystal region with a locally changed components of the alloy