Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering

doi:https://doi.org/10.1103/PhysRevB.79.220511

Title: Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering

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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:: 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

Publication Date:: 2009-06-19

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.

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                    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

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                    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.

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@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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