Metastable electron states in doped alloys Pb$_{1-x}$Sn$_{x}$Te

We present the results of an Investigation of nonequilibrium states and long-lived relaxation processes which occur in doped alloys Pb$_{1-x}$Sn$_{x}$Te at temperatures T≤20К when the system is brought, our of equilibrium by a quantizing magnetic field, IR illumination, or by a strong electric field. The obtained results Indicate that the energy spectrum of the alloys studied here contain electron metastable states.