Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering
Abstract
In the iron pnictides, the strong sensitivity of the iron magnetic moment to the arsenic position suggests a significant relationship between phonons and magnetism. We measured the phonon dispersion of several branches in the high-temperature tetragonal phase of CaFe{sub 2}As{sub 2} using inelastic x-ray scattering on single-crystal samples. These measurements were compared to ab initio calculations of the phonons. Spin-polarized calculations imposing the antiferromagnetic order present in the low-temperature orthorhombic phase dramatically improve agreement between theory and experiment. This is discussed in terms of the strong antiferromagnetic correlations that are known to persist in the tetragonal phase.
- Authors:
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 963966
- Report Number(s):
- IS-J 7502
Journal ID: 1098-0121; TRN: US0903345
- DOE Contract Number:
- DE-AC02-07CH11358
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 79; Journal Issue: 22
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARSENIC; IRON; MAGNETIC MOMENTS; MAGNETISM; PHONONS; PNICTIDES; SCATTERING; SENSITIVITY
Citation Formats
Hahn, S E, Lee, Y, Ni, N, Canfield, P C, Goldman, A I, McQueeney, R J, Harmon, B N, Alatas, A, Leu, B M, Alp, E E, Chung, D Y, Todorov, I S, and Kanatzidis, M G. Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering. United States: N. p., 2009.
Web. doi:10.1103/PhysRevB.79.220511.
Hahn, S E, Lee, Y, Ni, N, Canfield, P C, Goldman, A I, McQueeney, R J, Harmon, B N, Alatas, A, Leu, B M, Alp, E E, Chung, D Y, Todorov, I S, & Kanatzidis, M G. Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering. United States. https://doi.org/10.1103/PhysRevB.79.220511
Hahn, S E, Lee, Y, Ni, N, Canfield, P C, Goldman, A I, McQueeney, R J, Harmon, B N, Alatas, A, Leu, B M, Alp, E E, Chung, D Y, Todorov, I S, and Kanatzidis, M G. Fri .
"Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering". United States. https://doi.org/10.1103/PhysRevB.79.220511.
@article{osti_963966,
title = {Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering},
author = {Hahn, S E and Lee, Y and Ni, N and Canfield, P C and Goldman, A I and McQueeney, R J and Harmon, B N and Alatas, A and Leu, B M and Alp, E E and Chung, D Y and Todorov, I S and Kanatzidis, M G},
abstractNote = {In the iron pnictides, the strong sensitivity of the iron magnetic moment to the arsenic position suggests a significant relationship between phonons and magnetism. We measured the phonon dispersion of several branches in the high-temperature tetragonal phase of CaFe{sub 2}As{sub 2} using inelastic x-ray scattering on single-crystal samples. These measurements were compared to ab initio calculations of the phonons. Spin-polarized calculations imposing the antiferromagnetic order present in the low-temperature orthorhombic phase dramatically improve agreement between theory and experiment. This is discussed in terms of the strong antiferromagnetic correlations that are known to persist in the tetragonal phase.},
doi = {10.1103/PhysRevB.79.220511},
url = {https://www.osti.gov/biblio/963966},
journal = {Physical Review B},
number = 22,
volume = 79,
place = {United States},
year = {2009},
month = {6}
}
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