Single-doublet model of spin reorientation
Evgenii Vasinovich, Alexander Moskvin
TL;DR
This paper introduces a simple theoretical 'single-doublet' model to describe spin reorientation transitions in rare-earth orthoferrites and orthochromites, accounting for anisotropy and 4f-ion splitting effects.
Contribution
The model provides a unified framework to predict different types of spin reorientation transitions and analyze related thermodynamic and magnetic phenomena.
Findings
Predicts first-order, second-order, and mixed SR transitions
Analyzes effects of non-magnetic dilution and heat capacity anomalies
Describes behavior of rare-earth magnetic moments in SR region
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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Taxonomy
TopicsMultiferroics and related materials · Magnetic Properties and Synthesis of Ferrites · Inorganic Fluorides and Related Compounds