Abstract
The rare‐earth (RE) counterparts of francisite mineral Cu3Bi(SeO3)2O2Cl demonstrate strong interplay between d‐ and f‐magnetic subsystems and interesting magnetic properties, including multiferroicity. Herein, an optical spectroscopic study of a new member of the RE‐francisite family, dysprosium francisite, Cu3Dy(SeO3)2O2Cl, is presented. The inherent property of the Kramers degeneracy to be lifted by a magnetic field is used to study the magnetic and thermodynamic properties of the crystal. The splitting of the spectral lines corresponding to f–f transitions in the Dy3+ Kramers ion unambiguously points to the magnetic ordering of the crystal at a temperature of TN = 39 K. The value of the single‐ion anisotropy of the Dy3+ ion is estimated; it dominates the magnetic anisotropy of the copper subsystem. The specific behavior of the spectral lines in the vicinity of TN clearly indicates low‐dimensional magnetism and the interaction between the magnetic and charge degrees of freedom in Cu3Dy(SeO3)2O2Cl, i.e., the multiferroicity, previously reported in the literature for Cu3Bi(SeO3)2O2Cl.
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