The effect of pnictogen height on spin waves in iron pnictides

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Physical Review Letters

OSTI ID:1154817

Abernathy, Douglas L ^[1]; Zhang, Chenglin ^[2]; Harriger, Leland W. ^[3]; Yin, Zhiping ^[4]; Lv, Weicheng ^[2]; Wang, Miaoyin ^[2]; Tan, Guotai ^[5]; Song, Yu ^[6]; Egami, Takeshi ^[1]; Haule, Kristjan ^[4]; Kotliar, Gabriel ^[4]; Dai, Pengcheng ^[6]; Tian, Wei ^[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

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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1154817
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters
• Country of Publication: United States
• Language: English