The ac magnetic susceptibility (χ) was measured in the temperature range T = (1.5÷50) K for Pb_{1-x-y}Sn_{y}Mn_{x}Te samples with a composition y = 0.72, x = 0.015÷0.04 and carrier concentrations in the range p = (2.85÷14) × 10^{20} cm^{-3}. The breakdown of ferromagnetism and the formation of a spin glass phase are observed with an increasing carrier concentration. It is experimentally evidenced as continuous deviation of χ(T) from the characteristic critical behavior observed for ferromagnetic samples.
We will report on the anisotropy in (Pb)SnMnTe, studied by ferromagnetic resonance. We have found a cubic anisotropy with a = 73 × 10^{-4} cm^{-1} for Sn_{1-x}Mn_{x}Te and a = 200 × 10^{-4} cm^{-1} for Pb_{0.28-x}Sn_{0.72}Mn_{x}Te. We will indicate some possible explanations for this anomalously large anisotropy.
Specific heat of ZnCrSe and ZnCrS was measured for 1.5 < T < 10 K and B < 3 T. The data were interpreted using "crystal field model" taking into account tetrahedral crystal field, tetragonal Jahn-Teller distortion and spin-orbit interaction.
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