Abstract
This paper discusses exchange splitting in the spectra of Er3+ introduced as a spectroscopic probe in rare-earth ferroborates RFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub>(R=Y,Er,Tb,Gd). The temperatures of magnetic ordering are determined [38±1 K for YFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub>, 39±1 K for ErFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub>, 41±1 K for TbFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub>, 37±1 K for GdFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub>] and the spin-reorientation transition in GdFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub>: TR=7.5±0.5 K. Based on a comparison of the Er<sup>3+</sup> spectra in GdFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub>, the magnetic structure of which is known, and in other ferroborates, a conclusion is made concerning the orientation of the magnetic moments of iron M<sub>Fe</sub> in the magnetically ordered state: M<sub>Fe</sub>⊥c for yttrium and erbium ferroborates, and M<sub>Fe</sub>||c for terbium ferroborate.
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