MAGNETIC SUSCEPTIBILITY OF PbSnMnTe IN THE TRANSITION REGION BETWEEN FERROMAGNETIC AND SPIN GLASS PHASE

The ac magnetic susceptibility (χ) was measured in the temperature range T = (1.5+50) K for Pb1- 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) x 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.