Abstract
The transmission spectra of a 2D frustrated magnet Cu3Sm(SeO3)2O2Cl have been 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 have been determined for the ground and excited multiplets in the spectral range 2000 – 10000 cm-1. In the spectra two magnetic phase transitions were registered: at a temperature TN = 35 К, magnetic ordering occurs, and at a temperature of TR = 8.5 К, a spin-reorientation transition occurs. The ground Kramers doublet of the Sm3+ ion is split only at a low-temperature phase transition. The data obtained on the energy states of the ground 6H5/2 multiplet of the Sm3+ ion were used to calculate the contribution of samarium to the heat capacity of Cu3Sm(SeO3)2O2Cl.
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