Features of the dissipative electron transport near the boundary in the system Al(N)-In(S)

The temperature behavior of the coherent electron transport that arises in the presence of Andreev reflections is studied near the boundary of a hybrid system consisting of aluminum (N) and indium (S). The qualitative change of the temperature behavior upon changes in the electron mean free path l _el as a result of the elastic deformation of the sample is observed for the first time on the same sample, at probes mounted in the normal region at fixed distances and from the boundary. As the temperature is lowered, the measured effective resistance decreases for l _el ? L _{1, 2} and increases in a certain temperature region in which l _el ～ L _{1, 2}. It is shown that phenomena of this kind correspond to quantum-interference features in the scattering of coherent electronic and Andreev hole excitations on elastic centers.