Magnetic susceptibility, electron paramagnetic resonance and transport
properties of Sn1-xGdxTe semimagnetic semiconductor with 0.04 less th
an or equal to x less than or equal to 0.07 were investigated as a fun
ction of carrier concentration. For crystals with x < 0.05, an abrupt
increase of antiferromagnetic interspin interactions was found in samp
les with carrier concentration p = p() = (2.5-3.5) X 10(20) cm(-3) as
compared to samples with p > p().