Abstract
A low-temperature (0.4–4.2 K) measurement of the temperature dependences of the resistivity of two series of samples, SnTe1+y and Sn0.8Pb0.2Te1+y solid solution, doped with 5 at.% In, is reported. The parameters of the superconducting transition, namely, the critical temperatures Tc and the second critical magnetic field Hc2, and their dependences on tellurium excess (0⩽y⩽0.06) have been determined. The observed variation of the critical parameters with increasing tellurium excess in the samples is associated with a change in the filling by holes of the indium-impurity resonance states.
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