The following sequence of phase transformations is observed in the Nd0.6Ca0.4(Mn1−xCrx)O3 system: antiferromagnet (x=0), mixed magnetic state (0.015⩽x⩽0.04), ferrimagnet (0.04⩽x⩽0.8), and spin glass (x=1). At chromium concentrations near x∼0.5 the Néel temperature increases sharply, and the contribution from the Nd sublattice increases substantially. Since the chromium and manganese ions have a tendency to order, these results can be interpreted in a model of superexchange interactions.

Topics
Superexchange interactions, Magnetic materials, Phase transitions, Minerals, Transition metals
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