Probing Dy3+ magnetic moments in multiferroic perovskite DyMnO3 by optical spectroscopy
Abstract
We present a detailed temperature-dependent spectroscopic study of DyMnO3 single crystals with distorted perovskite structure. Energies of 36 crystal-field levels of Dy3+ in paramagnetic DyMnO3 were determined. The Dy3+ ground Kramers doublet does not split at TNMn = 39 K and splits below Tlock = 18 K. The splitting grows fast at temperatures near TNDy = 6.5 K and reaches 0 = 11 cm-1 at 4 K. Using the experimental temperature dependence 0(T), we calculate the dysprosium magnetic moment mDy(T) and the dysprosium contribution into specific heat and magnetic susceptibility. Analysing all the experimental data, we conclude that the Dy-Mn interaction is of the Dzyaloshinskii-Moriya type.
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