Abstract
Abstract It is suggested that the varius spin configurations in EuSe are stablized by lattice distortions. In the NNSS phase the distance between (111) planes alternately contract and expand, producing no macroscopic lattice dilatation but converting the phase transition to first order. In the NNS phase the distortion consists of two inter-plane expansions and one contraction, leading to a net macroscopic dilatation. The NSNS phase is accopanied by expansion of all inter-plane distance and thence by a net dilatation (three times larger than in NNS). These proposals are in qualitative agreement with available experimental data.
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