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

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

doi:10.1103/PhysRevB.79.220511

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

Full Record
Other Related Research

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 Lab., 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.

Copy to clipboard


                    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

Copy to clipboard


                    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. 2009.  
        "Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering".  United States.  https://doi.org/10.1103/PhysRevB.79.220511.

Copy to clipboard


                    
@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}

}

Copy to clipboard

Journal Article:

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

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Influence of magnetism on phonons in CaFe{sub 2}As{sub 2} as seen via inelastic x-ray scattering.

Journal Article Hahn, S; Lee, Y; Ni, N; ... - Phys. Rev. B

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.
https://doi.org/10.1103/PhysRevB.79.220511
First principles analysis of lattice dynamics for Fe-based superconductors and entropically-stabilized phases

Thesis/Dissertation Hahn, Steven

Modern calculations are becoming an essential, complementary tool to inelastic x-ray scattering studies, where x-rays are scattered inelastically to resolve meV phonons. Calculations of the inelastic structure factor for any value of Q assist in both planning the experiment and analyzing the results. Moreover, differences between the measured data and theoretical calculations help identify important new physics driving the properties of novel correlated systems. We have used such calculations to better and more e ciently measure the phonon dispersion and elastic constants of several iron pnictide superconductors. This dissertation describes calculations and measurements at room temperature in the tetragonal phasemore »« less
https://doi.org/10.2172/1048536

Full Text Available
Inelastic Neutron Scattering Study of a Nonmagnetic Collapsed Tetragonal Phase in Nonsuperconducting CaFe2As2: Evidence of the Impact of Spin Fluctuations on Superconductivity in the Iron-Arsenide Compounds

Journal Article Soh, Jing-Han; Tucker, Ggregory; Pratt, Daniel; ... - Physical Review Letters

The relationship between antiferromagnetic spin fluctuations and superconductivity has become a central topic of research in studies of superconductivity in the iron pnictides. We present unambiguous evidence of the absence of magnetic fluctuations in the nonsuperconducting collapsed tetragonal phase of CaFe2As2 via inelastic neutron scattering time-of-flight data, which is consistent with the view that spin fluctuations are a necessary ingredient for unconventional superconductivity in the iron pnictides. We demonstrate that the collapsed tetragonal phase of CaFe2As2 is nonmagnetic, and discuss this result in light of recent reports of high-temperature superconductivity in the collapsed tetragonal phase of closely related compounds.
https://doi.org/10.1103/PhysRevLett.111.227002
Inelastic Neutron Scattering Studies of the Spin and Lattice Dynamics inIron Arsenide Compounds

Journal Article Christianson, Andrew; Osborn, R.; Rosenkranz, Stephen; ... - Physica C

Although neutrons do not couple directly to the superconducting order parameter, they have nevertheless played an important role in advancing our understanding of the pairing mechanism and the symmetry of the superconducting energy gap in the iron arsenide compounds. Measurements of the spin and lattice dynamics have been performed on non-superconducting 'parent' compounds based on the LaFeAsO ('1111') and BaFe{sub 2}As{sub 2} ('122') crystal structures, and on electron and hole-doped superconducting compounds, using both polycrystalline and single crystal samples. Neutron measurements of the phonon density-of-state, subsequently supported by single crystal inelastic X-ray scattering, are in good agreement with ab initiomore »« less
Inelastic neutron scattering studies of the spin and lattice dynamics in iron arsenide compounds.

Journal Article Osborn, R; Rosenkranz, S; Goremychkin, E; ... - Physica C

Although neutrons do not couple directly to the superconducting order parameter, they have nevertheless played an important role in advancing our understanding of the pairing mechanism and the symmetry of the superconducting energy gap in the iron arsenide compounds. Measurements of the spin and lattice dynamics have been performed on non-superconducting 'parent' compounds based on the LaFeAsO ('1111') and BaFe{sub 2}As{sub 2} ('122') crystal structures, and on electron and hole-doped superconducting compounds, using both polycrystalline and single crystal samples. Neutron measurements of the phonon density-of-state, subsequently supported by single crystal inelastic X-ray scattering, are in good agreement with ab initiomore »« less
https://doi.org/10.1016/j.physc.2009.03.036

Similar Records