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Type: Artigo de periódico
Title: Raman scattering in the magnetically frustrated double perovskite Sr2YRuO6
Author: Garcia-Flores, AF
Terashita, H
Bittar, EM
Jardim, RF
Granado, E
Abstract: The spin correlations and excitations of the Sr2YRuO6 double perovskite are investigated by means of Raman scattering, complemented by synchrotron X-ray diffraction measurements. Anomalous softening of a breathing mode of the oxygen octahedra is observed below similar to 200K, much above the long-range antiferromagnetic ordering temperature, T-N1=32K, due to a spin-phonon coupling mechanism in the presence of magnetic correlations. A diffusive Raman signal is also observed, possibly associated with spin excitations within magnetically correlated regions. Our results point to a characteristic energy and temperature scale of similar to 25meV/200K below which unusual behavior associated with magnetic correlations is observed in this material. Copyright (c) 2013 John Wiley & Sons, Ltd.
Subject: magnetic correlations
spin-phonon coupling
double perovskites
magnetic frustration
X-ray diffraction
Country: EUA
Editor: Wiley-blackwell
Rights: fechado
Identifier DOI: 10.1002/jrs.4431
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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