Abstract
Optical spectroscopy of the f-f transitions in the non-Kramers Ho3+ ion was performed in a wide temperature range, from 4 K to room temperature, to study magnetic properties of the francisite-like holmium compound Cu3Ho(SeO3)2O2Cl. Despite the absence of symmetry doublets of the Ho3+ ion, its quasi-doublets were found, which are split in the exchange field acting on holmium ions in the magnetically ordered state of the crystal under study. From the splittings, the temperature of magnetic ordering was found, TN = 38 K. Two quasi-doublets of Ho3+ ion, namely, the ground and the first excited ones, with the energy gap 25 cm−1, contribute to the low-temperature magnetism of Cu3Ho(SeO3)2O2Cl. The energy structure of crystal-field levels of the ground multiplet 5I8 of the holmium ion was investigated, and the contribution of the rare-earth ion to the heat capacity of Cu3Ho(SeO3)2O2Cl was calculated.
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