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arXiv · 2512.14771

Single-doublet model of spin reorientation

Evgenii Vasinovich·Alexander Moskvin
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Abstract

A simple theoretical model is developed to describe spin reorientation (SR) transitions in rare-earth orthoferrites and orthochromites RFeO3 and RCrO3. Within a ``single-doublet'' approach, the free energy includes anisotropy contributions from the 3d-sublattice and the splitting of the lower doublet of 4f-ions. The model predicts various types of SR transitions - first-order, second-order, and mixed - depending on anisotropy parameters. Effects of non-magnetic dilution, heat capacity anomalies, and behavior of the rare-earth magnetic moment in the SR region are analyzed.

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Evgenii Vasinovich, Alexander Moskvin. 2025-12-16. Single-doublet model of spin reorientation. https://arxiv.org/abs/2512.14771

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