Influence of magnetism on phonons in CaFe2 As2 as seen via inelastic x-ray scattering

S. E. Hahn; Y. Lee; N. Ni; P. C. Canfield; A. I. Goldman; R. J. McQueeney; B. N. Harmon; A. Alatas; B. M. Leu; E. E. Alp; D. Y. Chung; I. S. Todorov; M. G. Kanatzidis

doi:10.1103/PhysRevB.79.220511

Influence of magnetism on phonons in CaFe2 As2 as seen via inelastic x-ray scattering

S. E. Hahn, Y. Lee, N. Ni, P. C. Canfield, A. I. Goldman, R. J. McQueeney, B. N. Harmon, A. Alatas, B. M. Leu, E. E. Alp, D. Y. Chung, I. S. Todorov, M. G. Kanatzidis

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34 Scopus citations

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 CaFe2 As2 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.

Original language	English
Article number	220511
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.79.220511
State	Published - Jun 19 2009
Externally published	Yes

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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. (2009). Influence of magnetism on phonons in CaFe2 As2 as seen via inelastic x-ray scattering. Physical Review B - Condensed Matter and Materials Physics, 79(22), Article 220511. https://doi.org/10.1103/PhysRevB.79.220511

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title = "Influence of magnetism on phonons in CaFe2 As2 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 CaFe2 As2 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.",

author = "Hahn, \{S. E.\} and Y. Lee and N. Ni and Canfield, \{P. C.\} and Goldman, \{A. I.\} and McQueeney, \{R. J.\} and Harmon, \{B. N.\} and A. Alatas and Leu, \{B. M.\} and Alp, \{E. E.\} and Chung, \{D. Y.\} and Todorov, \{I. S.\} and Kanatzidis, \{M. G.\}",

year = "2009",

month = jun,

day = "19",

doi = "10.1103/PhysRevB.79.220511",

language = "English",

volume = "79",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

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Hahn, SE, Lee, Y, Ni, N, Canfield, PC, Goldman, AI, McQueeney, RJ, Harmon, BN, Alatas, A, Leu, BM, Alp, EE, Chung, DY, Todorov, IS & Kanatzidis, MG 2009, 'Influence of magnetism on phonons in CaFe2 As2 as seen via inelastic x-ray scattering', Physical Review B - Condensed Matter and Materials Physics, vol. 79, no. 22, 220511. https://doi.org/10.1103/PhysRevB.79.220511

TY - JOUR

T1 - Influence of magnetism on phonons in CaFe2 As2 as seen via inelastic x-ray scattering

AU - Hahn, S. E.

AU - Lee, Y.

AU - Ni, N.

AU - Canfield, P. C.

AU - Goldman, A. I.

AU - McQueeney, R. J.

AU - Harmon, B. N.

AU - Alatas, A.

AU - Leu, B. M.

AU - Alp, E. E.

AU - Chung, D. Y.

AU - Todorov, I. S.

AU - Kanatzidis, M. G.

PY - 2009/6/19

Y1 - 2009/6/19

N2 - 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 CaFe2 As2 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.

AB - 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 CaFe2 As2 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.

UR - https://www.scopus.com/pages/publications/67650105719

U2 - 10.1103/PhysRevB.79.220511

DO - 10.1103/PhysRevB.79.220511

M3 - Article

AN - SCOPUS:67650105719

SN - 1098-0121

VL - 79

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 22

M1 - 220511

ER -

Influence of magnetism on phonons in CaFe2 As2 as seen via inelastic x-ray scattering

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