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High-resolution spectra of oriented ErFe 3 (BO 3)4  single crystals are registered in the spectral range 500 – 8000 cm -1  at various temperatures (4 – 470 K). The temperature behaviour of the phonon mode at 976 cm -1  allowed us to register a structural phase transition at T S =431 K. The energies of crystal-field levels of the ground  4  I  15/2  and the first excited  4  I  13/2  multiplets of the Er3+ ion are determined in the paramagnetic state of ErFe 3 (BO 3)4 . The exchange splitting of the ground Kramers doublet in the magnetically ordered state was found to be Δ 0 =6.3±1 cm -1 . The interference occurring due to birefringence in the single crystals was also registered. The temperature dependence of the position of the maximum of the interference band demonstrates two anomalies, at T N  and T S , associated with the phase transitions in ErFe 3 (BO 3)4 .

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Optical spectroscopy of ErFe3(BO3)4: detection of phase transitions and crystal-field levels of the Er3+ ground multiplet