Abstract
Detailed studies of temperature dependences of critical shear stress and strain-rate sensitivity of deforming stress of Pb–Bi single crystals with 0.1–6.0 at. % Bi are carried out in the temperature range 0.5–295 K. The deforming stress decrease during a superconducting transition of the sample is studied and the concentration dependence of the effect is measured. The ideas of a gradual transition (upon cooling) from thermally activated motion of dislocations through impurity barriers to the thermoinertial mechanism in the temperature range 10–25 K and further to the quantum-inertial motion at temperatures ≲1 K are developed. A detailed thermoactivation analysis of experimental data is carried out, and empirical estimates of internal stresses, dislocation–impurity interaction parameters, electron and phonon components of dynamic drag coefficient for dislocations are obtained.
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