Abstract
Thermal-wave SQUID susceptometry (TWS) is applied to determine the thermally modulated magnetic moment of a magnetic semiconductor Pb1-x-ySnxMnyTe (x=0.72, y=0.03) and of a magnetic semiconductor superlattice [EuTe(5)/PbTe(15)]400 together with their magnetic heat capacities within one working cycle. The former system is a ferromagnet with reentrance into a spin-glass behavior, the latter is an antiferromagnet-(EuTe)/paramagnet-(PbTe) superlattice grown by molecular beam epitaxy with few atomic layers (5/15) and 400 repeated periods. The surprisingly strong ferromagnetism in the superlattice EuTe/PbTe is believed to arise from the formation of coupled 2D polarons at the hetero-interfaces stabilized by dipole-dipole interaction.
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