Linearly polarized absorption spectra and magnetic circular dichroism (MCD) spectra of ErFe3(BO3)4 single crystal were measured in the range of 9000–23000 cm−1 at 90 K. The absorption spectra of f-f transitions were decomposed into the Lorentz shape components and intensities of the components were found. MCD spectra permitted us to measure the Zeeman splitting of some transitions and so to determine changes of the Landé factor along the C3 axis of the crystal during these transitions. Optical and magneto-optical properties of f-f transitions in the ErFe3(BO3)4 crystal were compared with those in the ErAl3(BO3)4 crystal. Substantial difference of the properties connected with the difference of the Er3+ ions local symmetry in two crystals was revealed. Large splitting of one of the f-f transitions without magnetic field, which is not possible for the Kramers doublets, was observed. It was explained by appearance of two absorbing centers due to the local decrease of symmetry in the excited state. Appreciable difference of the local vibrations energy in some excited states was revealed.
|Number of pages||9|
|Journal||Journal of Magnetism and Magnetic Materials|
|State||Published - 1 Nov 2018|
Bibliographical noteFunding Information:
The work was supported by the Russian Foundation for Basic Researches grant 16-02-00273 and by the Project of Russian Academy of Science No. 0356-2017-0030 .
© 2018 Elsevier B.V.
- Er ion
- Magnetic circular dichroism
- Rare earth ferroborates
- f-f transitions