HIGH-FIELD MAGNETIZATION OF SN1-XGDXTE

The magnetization of p-type Sn1 - xGdxTe with x up to 0.045 and the ho le concentration, p, varying from 2.7 to 8.3 x 10(20) cm(-3) has been measured in magnetic fields up to 27 T, at the temperatures 4.2 and 1. 3 K. The data were fitted to a magnetization equation with single-ion and pair terms. From comparison of the exchange parameters determined from the high-field magnetization with those previously obtained from the high-temperature magnetic susceptibility it was found that in samp les with p > 5 x 10(20) cm(-3) the exchange was of a short-range type, while in samples with a lower carrier concentration the long-range ex change mechanism was observed.