Raman scattering by phonons and magnons in NicMg1-cO solid solutions

E. Gazzanelli; A. Kuzmin; G. Mariotto; N. Mironova-Ulmane

doi:10.1117/12.515707

8 August 2003 Raman scattering by phonons and magnons in Ni_cMg_1-cO solid solutions

E. Gazzanelli, A. Kuzmin, G. Mariotto, N. Mironova-Ulmane

Proceedings Volume 5122, Advanced Organic and Inorganic Optical Materials; (2003) https://doi.org/10.1117/12.515707
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

The Raman scattering by phonons and magnons was studied at room temperature in polycrystalline solid solutions Ni_cMg_1-cO and pure NiO. The experimental Raman spectrum of NiO consists of six well resolved bands, whose origin is due to the disorder-induced one-phonon scattering (bands at 400 and 500 cm^-1), two-phonon scattering (bands at 750, 900 and 1100 cm^-1) and two-magnon scattering (band at 1500 cm^-1). In Ni_cMg_1-cO solid solutions, a relative increase of one-phonon scattering is observed upon a dilution of nickel oxide by magnesium ions: at room temperature, the two-magnon band becomes invisible for c < 0.7, whereas the two-phonon contribution disappears at c < 0.5. Such behavior is explained by disorder-induced effect, caused by chemical substitution and off-center displacement of nickel ions.

Citation Download Citation

E. Gazzanelli, A. Kuzmin, G. Mariotto, and N. Mironova-Ulmane "Raman scattering by phonons and magnons in Ni_cMg_1-cO solid solutions", Proc. SPIE 5122, Advanced Organic and Inorganic Optical Materials, (8 August 2003); https://doi.org/10.1117/12.515707

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