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Magnetism dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering

TitleMagnetism dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering
Publication TypeJournal Article
Year of Publication2013
AuthorsHahn, SE, Tucker, GS, Yan, JQ, Said, AH, Leu, BM, McCallum, RW, Alp, EE, Lograsso, TA, McQueeney, RJ, Harmon, BN
JournalJournal of Applied Physics
Volume113
Pagination17e153
Date Published05
Type of ArticleArticle; Proceedings Paper
ISBN Number0021-8979
Accession NumberWOS:000319292800315
Keywordshigh-temperature superconductivity
Abstract

The phonon dispersion was measured at room temperature (above the Neel temperature T-N) along (0,0,L) in the tetragonal phase of LaFeAsO using inelastic x-ray scattering. Magnetostructural effects are well documented in the AFe(2)As(2)-based (A = Ca, Sr, Ba, Eu) systems. Only recently have single crystals of LaFeAsO become available. The experimentally observed splitting between two A(1g) phonon modes at 22 and 26 meV is only reproduced in spin-polarized calculations. Magnetostructural effects similar to those observed in the AFe(2)As(2) materials are confirmed to be present in LaFeAsO. This is discussed in terms of the strong antiferromagnetic correlations that are known to persist above T-N and into the tetragonal phase. (C) 2013 AIP Publishing LLC

DOI10.1063/1.4800657
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