High temperature magnetic susceptibility of Hg1-xFexSe

Magnetic susceptibility of diluted magnetic semiconductor Hg1-xFexSe (x = 0.04, 0.08, 0.11) has been measured in the temperature range 50-300 K. Observed temperature dependence above 90 K is analyzed in terms of the high temperature expansion of the magnetic susceptibility developed for Fe-type diluted magnetic semiconductors. The nearest neighbour exchange constant is estimated as J(NN)/k(B) = (-11 +/- 3) K. At higher temperatures, considerable deviation of the magnetic susceptibility from the Curie-Weiss law is detected. (C) 1997 Elsevier Science Ltd