Effect of pnictogen height on spin waves in iron pnictides

Chenglin Zhang, Leland W. Harriger, Zhiping Yin, Weicheng Lv, Miaoyin Wang, Guotai Tan, Yu Song, D. A. Abernathy, Wei Tian, Takeshi Egami, Kristjan Haule, Gabriel Kotliar, Pengcheng Dai

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


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 and dynamical mean field theory and provide strong evidence that pnictogen height controls the strength of electron-electron correlations and consequently the effective bandwidth of magnetic excitations.

Original languageEnglish (US)
Article number217202
JournalPhysical review letters
Issue number21
StatePublished - May 28 2014

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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