Abstract
Optical absorption spectra of KNiF3 and NiO stoichiometric single-crystals were measured at 5 K in the range from 4000 to 50000 cm-1. The observed bands are interpreted based on the energy levels diagram for Ni2+ (3d 8) ion in a cubic crystal field. The crystal-field parameter Dq is equal to 766 cm-1 in KNiF3 and 890 cm-1 in NiO. Particular attention is paid to the band due to the magnetic-dipole 3A2g(F)→3T2g(F) transition, located at 7700 cm-1 in KNiF3 and at 8900 cm-1 in NiO. We show that the energy difference between the two peaks, located at the low energy side of the band, is related to the zone-center (k=0) one-magnon energy, so that the low-energy peak is attributed to the pure exciton transition, whereas the high-energy peak to the excitors magnon excitation. The estimated onemagnon energies are 25 ± 5 cm-1 in KNiF3 and 39 ± 3 cm-1 in NiO.
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Mironova, N., Skvortsova, V., Kuzmin, A., Sildos, I. and Zazubovich, N. (to be published).
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Mironova, N., Skvortsova, V., Kuzmin, A., Sildos, I., Zazubovich, N. (2000). Low Temperature Optical Absorption by Magnons in KNiF3 and NiO Single-Crystals. In: Borstel, G., Krumins, A., Millers, D. (eds) Defects and Surface-Induced Effects in Advanced Perovskites. NATO Science Series, vol 77. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4030-0_16
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DOI: https://doi.org/10.1007/978-94-011-4030-0_16
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