Quasi-doublets of non-Kramers Ho3+ ion and magnetic ordering of holmium francisite-analog Cu3Ho(SeO3)2O2Cl

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, T_N = 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.

Key words: Rare-earth francisite-like crystals, Cu₃Ho(SeO₃)₂O₂Cl, optical spectroscopy, quasi-doublets, Ho³⁺ crystal-field f–f transitions, magnetic ordering.

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