The magnetic properties of a ferroborate single crystal of substituted composition Sm 0.7 H 0.3 Fe 3 (BO 3 ) 4 with competing Sm-Fe and Ho-Fe exchange interactions are studied. The measured properties and effects are interpreted in terms of a general theoretical approach based on the molecular field approximation and calculations using the crystal field model for a rare-earth ion. The experimental temperature dependences of the initial magnetic susceptibility in the temperature range 2–300 K, the anomalies in the magnetization curves for B ‖ c and B ⊥ c in fields lower than 1.2 T, and the field and temperature dependences of magnetization in fields lower than 9 T are described. The crystal field parameters and the parameters of the R-Fe and Fe-Fe exchange interactions are determined during the interpretation of the experimental data.
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Demidov et al. (2012) studied this question.
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