Crystal field effects in rare-earth ferroborates RFe3(BO3)4 with R = Nd, Tb, Dy, or Er
D. V. VolkovMoscow State University, Moscow, 119992, RussiaА. А. ДемидовBryansk State Technical University, Bryansk, 241035, RussiaN. P. KolmakovaBryansk State Technical University, Bryansk, 241035, RussiaL. V. TakunovBryansk State Technical University, Bryansk, 241035, Russia
2008en
ABI
Abstract
Crystal field effects in rare-earth ferroborates RFe3(BO3)4 with various rare-earth elements are studied theoretically. The rare-earth magnetoelastic interaction Hamiltonian is written in a multipole approximation. The field and temperature dependences of the multipole moments and strain susceptibilities of rare-earth ions in the ferroborate structure are calculated. A comparative analysis of anomalies in the thermal expansion and elastic constants of rare-earth ferroborates with Tb and Dy ions having identical magnetic structure but differing in the degree of anisotropy of the rare-earth ion is performed.
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