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Crystal field and exchange interactions in the SmFe3(BO3)4 multiferroic |
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| Authors: | M. N. Popova E. P. Chukalina B. Z. Malkin D. A. Erofeev L. N. Bezmaternykh I. A. Gudim |
| Affiliation: | 1. Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, 142190, Russia 2. Kazan (Privolzhsky) Federal University, Kazan, 420008, Russia 3. Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow oblast, 141700, Russia 4. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia |
| Abstract: | The optical spectra of oriented SmFe3(BO3)4 single crystals are studied in the region of the f-f transitions in the Sm3+ ion by Fourier spectroscopy. The energies, the symmetry properties, and the exchange splittings of the Stark sublevels of the ground and 17 excited multiplets of the Sm3+ ion in a crystal field of symmetry D 3 are determined from the measured temperature dependences of polarized-radiation absorption spectra. The parameters of the crystal field acting on samarium ions and the parameters of the exchange interaction between Sm3+ and Fe3+ ions are found. The anisotropy of the effective exchange interaction is shown to be substantially stronger than the magnetic anisotropy, due to a strong crystal-field-induced mixing of the ground and excited multiplets. |
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