Optics and Spectroscopy, 2022 Volume 130, Issue 1,Pages 39–48(Mi os1638)
Materials of the International Seminar of the Institute of Spectroscopy of the Russian Academy of Sciences (ISAN), dedicated to the anniversary of Professor M.N. Popova Spectroscopy of condensed state
Crystal-field levels of Sm$^{3+}$ ion in low-dimensional magnetic Cu$_3$Sm(SeO$_3$)$_2$O$_2$Cl
Abstract:
The transmission spectra of a two-dimensional frustrated magnetic Cu$_3$Sm(SeO$_3$)$_2$O$_2$Cl were measured in the region of $f$–$f$-transitions of the Sm$^{3+}$ ion in a wide temperature range (4–300 K). The energies of 40 crystal-field levels of the Sm$^{3+}$ 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 $T_{\mathrm{N}}$ = 35 K, magnetic ordering occurs, and at temperature of $T_{\mathrm{R}}$ = 8.5 K – spin-reorientation transition. The ground Kramers doublet of the Sm$^{3+}$ 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 Sm$^{3+}$ ion are used to calculate the contribution of samarium to the heat capacity of Cu$_3$Sm(SeO$_3$)$_2$O$_2$Cl.
Keywords:francisite-like phases with rare-earth elements, optical spectroscopy, Kramers doublets, magnetic phase transitions, spin reorientation.
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