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Title: The effect of pnictogen height on spin waves in iron pnictides

We use inelastic neutron scattering to study spin waves in the antiferromagnetic ordered phase of iron pnictide NaFeAs throughout the Brillouin zone. Comparing with the well-studied AFe2As2 (A = Ca,Sr,Ba) family, spin waves in NaFeAs have considerably lower zone boundary energies and more isotropic effective in-plane magnetic exchange couplings. These results are consistent with calculations from a combined density functional theory (DFT) and dynamical mean field theory (DMFT), and provide strong evidence that pnictogen height controls the strength of electron-electron correlations, and consequently the effective bandwidth of magnetic excitations.
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2] ;  [5] ;  [6] ;  [1] ;  [4] ;  [4] ;  [6] ;  [1]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
  3. NIST Center for Neutron Research (NCRN), Gaithersburg, MD
  4. Rutgers University
  5. University of Tennessee (UT)
  6. Rice University
Publication Date:
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters
Research Org:
Oak Ridge National Laboratory (ORNL); Spallation Neutron Source
Sponsoring Org:
SC USDOE - Office of Science (SC)
Country of Publication:
United States