Abstract
Field-induced spin-flop transitions in α -MnMoO 4 are summarized in magnetic H – T phase diagrams for different directions of the applied magnetic field up to 12 T. The antiferromagnetic arrangement in the spin-flop phase is preserved at least up to this field for a field parallel to the easy direction. This high transition field is in contrast to the low one of α -NiMoO 4 and favours a model, based on dominant antiferromagnetic supersuperexchange couplings in α -MnMoO 4 over a ferromagnetic Mn 4 “cluster” model. The Néel temperature of 9.8(1) K was determined from the corresponding specific-heat anomaly, measured on a single crystal of α -MnMoO 4.
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