부산대학교 도서관

The optical spectra of oriented SmFe(BO) single crystals are studied in the region of the f- f transitions in the Sm 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 Sm ion in a crystal field of symmetry D 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 Sm and Fe 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. [ABSTRACT FROM AUTHOR]