Probing Dy³⁺ magnetic moments in multiferroic perovskite DyMnO₃ by optical spectroscopy

Abstract

We present a detailed temperature‐dependent (4–300 K) 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 TnormalNMn and splits below Tlock = 18 K. The splitting grows fast at temperatures near TnormalNDy and reaches Δ0 ≈ 11 ± 2 cm–1 at 4 K. Using the experimental temperature dependence Δ0(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.

Coexistence of the magnetically ordered and Haldane states in (Y1-xNdx)2BaNiO5

“…Small line splittings are hidden in the linewidth but the spectral weight shifts to higher frequencies by Δ/2. A similar behavior was observed in the case of DyMnO 3 [13]. Thus, spectroscopic data allowed us to find Δ as a function of temperature.…”

Probing the role of Nd3+ ions in the weak multiferroic character of NdMn2O5 by optical spectroscopies

“…To additionally checking whether the phase transitions observed in the magnetization measurements and the heat capacity measurements are connected to the Nd 3+ ions or not, we have evaluated the Neodymium contributions to the magnetic susceptibility χNd(T) and specific heat CNd(T), according to equations ( 2) and ( 3) respectively [37][38][39]:…”

Magnetic Ordering and Interplay between the Magnetic and Charge Subsystems in New Francisite‐Analog Cu3Dy(SeO3)2O2Cl as Studied by the Spectroscopy of Kramers Doublets

“…This assumption is confirmed experimentally for many mixed d – f magnetic systems, where the observed exchange splittings of Kramers doublets are proportional precisely to the magnetic moment of the d subsystem and are in no way proportional to the magnetic moment of the f subsystem. [ 42,45,48–50 ] It will be shown below that this assumption is valid for the studied compound.…”

“…We use the methodology of deriving magnetic properties from temperature‐dependent spectroscopic data on the CF levels of Dy 3+ ion, which we previously applied to study another mixed d–f magnetic system, DyMnO 3 . [ 45 ] By studying the temperature behavior of the f–f transitions of the Dy 3+ ion in Cu 3 Dy(SeO 3 ) 2 O 2 Cl, we show that the compound orders magnetically at low temperatures and demonstrates both low‐dimensional magnetic and multifferoic behavior. We show that magnetic anisotropy of the Dy magnetic subsystem can be estimated from the spectroscopic data and that it dominates the magnetic anisotropy of the copper subsystem.…”