Magnetic ordering and interplay between the magnetic and charge subsystems in new francisite-analog Cu3Dy(SeO3)2O2Cl as studied by the spectroscopy of Kramers doubletsстатья
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Аннотация: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. Here we present an optical spectroscopic study of a new member of the RE-francisite family, dysprosium francisite, Cu3Dy(SeO3)2O2Cl. We use the inherent property of the Kramers degeneracy to be lifted by a magnetic field 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. We have estimated the value of the single-ion anisotropy of the Dy3+ ion, 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.
