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

S. E. Hahn; G. S. Tucker; J. Q. Yan; A. H. Said; B. M. Leu; R. W. McCallum; E. E. Alp; T. A. Lograsso; R. J. McQueeney; B. N. Harmon

doi:10.1063/1.4800657

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

S. E. Hahn, G. S. Tucker, J. Q. Yan, A. H. Said, B. M. Leu, R. W. McCallum, E. E. Alp, T. A. Lograsso, R. J. McQueeney, B. N. Harmon

Correlated Electron Materials

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Abstract

The phonon dispersion was measured at room temperature (above the Néel 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 AFe₂As₂-based (A Ca, Sr, Ba, Eu) systems. Only recently have single crystals of LaFeAsO become available. The experimentally observed splitting between two A 1 g 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 T_N and into the tetragonal phase.

Original language	English
Article number	17E153
Journal	Journal of Applied Physics
Volume	113
Issue number	17
DOIs	https://doi.org/10.1063/1.4800657
State	Published - May 7 2013

Funding

This research supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-07CH11358. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. The construction of HERIX was partially supported by the NSF under Grant No. DMR-0115852.

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title = "Magnetism dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering",

abstract = "The phonon dispersion was measured at room temperature (above the N{\'e}el 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 A 1 g 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.",

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AU - Hahn, S. E.

AU - Tucker, G. S.

AU - Yan, J. Q.

AU - Said, A. H.

AU - Leu, B. M.

AU - McCallum, R. W.

AU - Alp, E. E.

AU - Lograsso, T. A.

AU - McQueeney, R. J.

AU - Harmon, B. N.

PY - 2013/5/7

Y1 - 2013/5/7

N2 - 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 A 1 g 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.

AB - 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 A 1 g 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.

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

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