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Crystal-field levels of Sm³⁺ ion in low-dimensional magnetic Cu₃Sm(SeO_3)₂O₂Cl

Russian version

DOI: 10.21883/EOS.2022.01.52985.37-21

Klimin S. A. ¹, Kuznetsova E. S. ², Berdonosov P. S. ²

¹Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia
²Lomonosov Moscow State University, Moscow, Russia

Email: klimin@isan.troitsk.ru

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Abstract
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The transmission spectra of a two-dimensional frustrated magnetic Cu₃Sm(SeO_3)₂O₂Cl were measured in the region of f-f-transitions of the Sm³⁺ ion in a wide temperature range (4-300 K). The energies of 40 crystal-field levels of the Sm³⁺ ion are determined for the ground and excited multiplets in the spectral region of 2000-10 000 cm^-1. The spectra revealed two magnetic phase transitions: at temperature of T_N=35 K, magnetic ordering occurs, and at temperature of T_R=8.5 K - spin-reorientation transition. The ground Kramers doublet of the Sm³⁺ ion splits only at a low-temperature phase transition. The data obtained on the energy states of the ground multiplet ^6H_5/2 of the Sm³⁺ ion are used to calculate the contribution of samarium to the heat capacity of Cu₃Sm(SeO_3)₂O₂Cl. Keywords: francisite-like phases with rare-earth elements, optical spectroscopy, Kramers doublets, magnetic phase transitions, spin reorientation.

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