Abstract
The Hall coefficient and resistivity were measured on a series of samples of Pb x Sn 1− x Te with 0⩽ x⩽0.45 and 5 at% of InTe as a dopant. All samples show p-type conductivity with hole concentration in the range from 10 19 to 10 21 cm −3 at 77 K . A slight decrease of Hall mobility and corresponding increase in the scattering cross-section of holes by impurity atoms was observed with an extremum at x=0.25. All samples exhibit a transition to a superconducting state with the critical temperatures ranging from 0.3 to 3.0 K . The maximum of d H c2/d T (where H c2 is the second critical field) correlates with the fall in mobility (or rise in the scattering cross-section of holes), which shows that the resonance scattering mechanism is playing an important role in the enhancement of superconducting properties of these solid solution materials.
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