Raman scattering in the magnetically frustrated double perovskite Sr2YRuO6. (18th December 2013)

• Record Type: Journal Article
• Authors: García‐Flores, A. F.; Terashita, H.; Bittar, E. M.; Jardim, R. F.; Granado, E.
• Is Part Of: Journal of Raman spectroscopy. Volume 45:Number 2(2014:Feb.)
• Page Start: 193
• Page End: 196
• Publication Date: 2013-12-18
• Subjects: Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.4431
• Languages: English
• ISSNs: 0377-0486

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 ~200 K, much above the long‐range antiferromagnetic ordering temperature, <italic>T</italic>_{<italic>N</italic>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 &amp; Sons, Ltd.</p> </abstract>