Document Type

Conference Proceeding

Conference

12th Joint MMM/Intermag Conference

Publication Date

4-15-2013

City

Chicago, IL

Abstract

The phonon dispersion was measured at room temperature (above the Néel temperature TN) along (0,0,L) in the tetragonal phase of LaFeAsO using inelastic x-ray scattering. Magnetostructural effects are well documented in the AFe2As2-based (A = Ca, Sr, Ba, Eu) systems. Only recently have single crystals of LaFeAsO become available. The experimentally observed splitting between two A1g phonon modes at 22 and 26 meV is only reproduced in spin-polarized calculations. Magnetostructural effects similar to those observed in the AFe2As2 materials are confirmed to be present in LaFeAsO. This is discussed in terms of the strong antiferromagnetic correlations that are known to persist above TN and into the tetragonal phase.

Comments

Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Journal of Applied Physics 113 (2012): 17E153 and may be found at http://dx.doi.org//10.1063/1.4800657.

Copyright Owner

American Institute of Physics

Language

en

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