Abstract
High field magnetization experiments (B⩽35 T) have been performed at 1.8 K in Hg 1− x Mn x Te ( x = 0.0056) and Hg 1− x Mn x Se ( x = 0.065). At B > 6 T the magnetization exhibits step-like increases due to the magnetic field alignment of the antiferromagnetically coupled nearest neighbor Mn pairs and triangles. A theoretical fit of the magnetization curves provide a determination of NN exchange constants J NN k B = (-5.1 ±0.5) K for Hg 1−xMn xTe and J NN K B = (-6±0.5)K for Hg 1− x Mn x Se. Analysis of all the presently available J NN values for semimagnetic semiconductors is presented and the observed trends and discrepancies are discussed.
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