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Type: Artigo de evento
Title: Magnetically Frustrated Behavior In Multiferroics R Mn2 O 5 (r=bi, Eu, And Dy): A Raman Scattering Study
Author: Garcia-Flores A.F.
Granado E.
Martinho H.
Rettori C.
Golovenchits E.I.
Sanina V.A.
Oseroff S.B.
Park S.
Cheong S.-W.
Abstract: A temperature dependent Raman scattering study in multiferroic single crystals R Mn2 O5 (R=Bi, Eu, and Dy) was performed. The Raman spectra were measured in the range from 150 to 450 cm-1 involving mostly Mn-O-Mn bending vibrations, complementing our previous work in a higher frequency range involving Mn-O stretching modes. A number of studied phonons present anomalous frequency behavior below a characteristic temperature, T* ∼60-65 K, such as that found for the stretching modes. The sign and magnitude of such anomalous behavior appear to be correlated with the ionic radius of R, being softening for R=Bi and hardening for R=Eu and Dy in the range between TC TN and T*. The anomalous phonon behaviors in both bending and stretching modes are consistent with an interpretation in terms of the spin-phonon coupling in a scenario of strong magnetic correlations. © 2007 American Institute of Physics.
Rights: aberto
Identifier DOI: 10.1063/1.2712955
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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