RESONANT STATE OF 4F(14 13) YB ION IN PB1-XGEXTE/

The study of transport and of magnetic properties of Pb1-xGexTe:Yb mix ed crystals (0 less than or equal to x less than or equal to 0.04) is reported. It is shown that Yb forms a donor state resonant with tile P bTe valence band. The donor state position may be tuned (shifted relat ive to tile energy gap) by admixture of Ge. The properties of the Yb i on in the Pb1-xGexTe matrix makes the system unique from the point of view of magnetic properties. It is demonstrated that the change of the conductivity type from p to n induces transitions from tile paramagne tic state to the diamagnetic one.