Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/85230
Type: Artigo
Title: Two-magnon Raman scattering in LiMnPO4
Author: Calderon Filho, C. J.
Gomes, P. F.
García-Flores, A. F.
Barberis, G. E.
Granado, E.
Abstract: Two-magnon Raman scattering is observed in the orthophosphate LiMnPO4, carrying quantitative information on the magnetic interactions between local Mn2+ moments. A simulated annealing fitting procedure of the Raman signal to theoretical curves derived from a magnetic Hamiltonian was carried out, taking exchange and anisotropy constants as free fitting parameters. Previously reported inelastic neutron scattering (INS) data [J. Li et al., Phys. Rev. B 79, 144410 (2009)] were also used in the fit. It is shown that the combined application of INS and Raman scattering data in the fit reduces the ambiguity of the determined set of exchange parameters with respect to fitting procedures using INS or Raman data independently. The temperature dependence of the Raman signal does not show a collapse of the two magnon excitations at the long-range magnetic ordering temperature, TN = 34 K, supporting significant short-range spin correlations above TN.
Two-magnon Raman scattering is observed in the orthophosphate LiMnPO4, carrying quantitative information on the magnetic interactions between local Mn2+ moments. A simulated annealing filling procedure of the Raman signal to theoretical curves derived from a magnetic Hamiltonian was carried out, taking exchange and anisotropy constants as free fitting parameters. Previously reported inelastic neutron scattering (INS) data [J. Li etal., Phys. Rev. B 79, 144410 (2009)] were also used in the fit. It is shown that the combined application of INS and Raman scattering data in the fit reduces the ambiguity of the determined set of exchange parameters with respect to fitting procedures using INS or Raman data independently. The temperature dependence of the Raman signal does not show a collapse of the two-magnon excitations at the long-range magnetic ordering temperature, T-N = 34K, supporting significant short-range spin correlations above T-N.
Subject: Efeito magnetoelétrico, Raman, Efeito de, Antiferromagnetismo
Country: Holanda
Editor: Elsevier
Citation: Journal Of Magnetism And Magnetic Materials. Elsevier, v. 377, n. , p. 430 - 435, 2015.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2014.10.100
Address: https://www.sciencedirect.com/science/article/pii/S0304885314010130
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

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