Study of crystal-field excitations and Raman active phonons in o-DyMnO3

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

“…Our data for 6 H 13/2 are consistent with those of Ref. [14], whereas we correct the position of the lowest excited level of the ground multiplet and instead of one CF level near 185 cm -1 resolve two close levels. Several lowest excited CF levels of the ground multiplet were found from the temperaturedependent spectra (the lines starting from excited levels freeze out with lowering the temperature, see, e.g., Fig.…”

“…The contributions of dysprosium describe reasonably well low‐temperature anomalies in χ ( T ) and C ( T ) reported in the experiments on DyMnO 3 . We note that Δ 0 (0) = 30 cm –1 fails to explain the measured χ ( T ) dependence (Fig. c).…”

“…In Ref. [14], the only CF levels presented were one and five ones for the 6 H 15/2 and 6 H 13/2 multiplets, respectively. Our data for 6 H 13/2 are consistent with those of Ref.…”

“…Inset in (a) illustrates Dy line splitting in a magnetically ordered state. Inset and the dashed line in (c) display a hypothetical Dy contribution in the case of Δ 0 (0) = 30 cm -1 [14].…”

“…Little is known on Dy CF levels and their splitting in magnetically ordered states of DyMnO 3 . Infrared transmission study of DyMnO 3 at several temperatures [14] reports on 5 out of 7 CF levels of the first excit-ed 6 H 13/2 multiplet and gives the values 30 and 185 cm -1 for the splitting of the ground Kramers doublet below = 39 K and the energy of the next Kramers doublet at 100 K, respectively. However, these two latter values cannot be determined unambiguously and reliably without studying a detailed temperature dependence of spectral lines.…”