Raman scattering by spin excitations in a-MnSe
A. Milutinovic´, N. Tomic´, S. Devic´, P. Milutinovic´, and Z. V. Popovic´
Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade/Zemun, Yugoslavia
~Received 27 February 2002; published 28 June 2002!
Abstract
Raman spectra of polycrystalline a-MnSe were measured in the temperature range from 17 to 100 K. We found a peak at 18 cm21 at low temperatures that shifts to lower frequencies when the temperature increases. From frequency vs temperature dependence we assigned it as one magnon mode at k50. The magnon dispersion relations were calculated using random phase Green function approximation. The exchange energies were estimated. The Ne´el temperature was determined by fitting the v1M(T)/v1M(0)5 f(T/TN) dependence with the experimental data.
http://www.solid.ipb.ac.rs/pdf/PRB66_2002_012302.pdf
Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade/Zemun, Yugoslavia
~Received 27 February 2002; published 28 June 2002!
Abstract
Raman spectra of polycrystalline a-MnSe were measured in the temperature range from 17 to 100 K. We found a peak at 18 cm21 at low temperatures that shifts to lower frequencies when the temperature increases. From frequency vs temperature dependence we assigned it as one magnon mode at k50. The magnon dispersion relations were calculated using random phase Green function approximation. The exchange energies were estimated. The Ne´el temperature was determined by fitting the v1M(T)/v1M(0)5 f(T/TN) dependence with the experimental data.
http://www.solid.ipb.ac.rs/pdf/PRB66_2002_012302.pdf
Hello, my name is Dr Abderrahmane Reggad. I'm a 51 year old and I am a researcher in materials' sciences.
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