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Raman scattering in the magnetically frustrated double perovskite Sr 2 YRuO 6
Author(s) -
GarcíaFlores A. F.,
Terashita H.,
Bittar E. M.,
Jardim R. F.,
Granado E.
Publication year - 2014
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4431
Subject(s) - raman spectroscopy , antiferromagnetism , condensed matter physics , raman scattering , perovskite (structure) , chemistry , spin (aerodynamics) , phonon , atmospheric temperature range , synchrotron radiation , synchrotron , softening , diffraction , nuclear magnetic resonance , materials science , crystallography , physics , optics , meteorology , thermodynamics , composite material
The spin correlations and excitations of the Sr 2 YRuO 6 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 ~200 K, much above the long‐range antiferromagnetic ordering temperature, T N 1 = 32 K, 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 ~25 meV/200 K below which unusual behavior associated with magnetic correlations is observed in this material. Copyright © 2013 John Wiley & Sons, Ltd.