Energy spectrum and parameters of deep impurity level in Pb1-xGexTe alloys doped with Yb

In this paper, the galvanomagnetic properties (4.2 less than or equal to T less than or equal to 300 K) of Pb1-xGexTe (x less than or equal to 0.04) alloys doped with ytterbium were investigated under both atmospheric pressure and hydrostatic compression up to 12 kbar. The variation of the energy diagram of Pb1-xGexTe[Yb] under variation of the Ge concentration and under pressure were proposed. It was shown that change of energy spectrum under pressure leads to the insulator-metal transition due to the redistribution of electrons between the valence band and the Yb-induced deep level. By comparing theoretical and experimental dependences of Fermi energy and free hole concentration on pressure the main parameters of Yb-induced deep level were determined. [S0163-1829(99)09919-1].