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Title: 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}
}