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Influence of radiation defects on the optical absorption spectrum of nickel oxide (NiO) was studied at 6 K in the near-IR
energy range of 7750-8300 cm-1 corresponding to the magnetic-dipole transition 3A2g(F)->3T2g(F) at nickel sites. NiO
single crystals grown by the method of chemical transport reactions on the MgO(100) substrates were irradiated by the
neutron fluences up to 5x1018 cm-2. Two sharp lines were observed at the low-energy side of the band: the peak at
7805 cm-1 is assigned to the pure exciton transition, whereas the peak at 7845 cm-1, to the exciton-magnon excitation that
occurs at the Brillouin zone-center (BZC). An increase of the defect concentration at higher fluences results in the
lowering of the magnon-satellite-peak intensity. The long-wavelength BZC magnon absorption is sensitive to the long-
range magnetic ordering, which becomes destroyed in the presence of the radiation defects. Therefore, the observed
decrease of the peak intensity is attributed to the decrease of the spin-spin correlation length due to inhomogeneous
broadening.
Nina Mironova-Ulmane,Vera Skvortsova,Alexei Kuzmin, andIlmo Sildos
"Influence of radiation defects on exciton-magnon interactions in nickel oxide", Proc. SPIE 5946, Optical Materials and Applications, 59460D (12 June 2006); https://doi.org/10.1117/12.639158
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Nina Mironova-Ulmane, Vera Skvortsova, Alexei Kuzmin, Ilmo Sildos, "Influence of radiation defects on exciton-magnon interactions in nickel oxide," Proc. SPIE 5946, Optical Materials and Applications, 59460D (12 June 2006); https://doi.org/10.1117/12.639158