Abstract
Recent experimental data for magnetostriction in the rare-earth (RE) ferroborates RFe 3 (BO 3 ) 4 with R=Pr and Tb are discussed from a theoretical point of view. Multipole moments of RE ions are calculated in the framework of a crystal-field model for the RE ion and the molecular-field approximation. Quadrupole approximation is shown to be sufficient for interpretation of data for longitudinal magnetostriction at the magnetic field along the trigonal axis. Parameters of PrFe 3 (BO 3 ) 4 are deduced when accounting for the experimental magnetization curves that manifest a spin–flop transition.
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