High energy spin excitations in BaFe2As2

Abstract

We report neutron scattering measurements of cooperative spin excitations in antiferromagnetically ordered BaFe2As2, the parent phase of an iron pnictide superconductor. The data extend up to ~100meV and show that the spin excitation spectrum is sharp and highly dispersive. By fitting the spectrum to a linear spin-wave model we estimate the magnon bandwidth to be in the region of 0.17eV. The large characteristic spin fluctuation energy suggests that magnetism could play a role in the formation of the superconducting state.

4 pages, 4 figures; v2: minor changes to the text and abstract and more general expressions for the linear spin-wave cross section included

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Cited by in corpus (9)

• Itinerant magnetic excitations in antiferromagnetic CaFe2As2
• Anisotropic itinerant magnetism and spin fluctuations in BaFe2As2: A neutron scattering study
• Anisotropy, Itineracy, and Magnetic Frustration in High-Tc Iron Pnictides
• Quantum oscillations in the parent pnictide BaFe${}_2$As${}_2$ : itinerant electrons in the reconstructed state
• Pnictides as frustrated quantum antiferromagnet close to a quantum phase transition
• Correlation effects in the iron pnictides
• Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2
• Normal State Spin Dynamics of Five-band Model for Iron-pnictides
• Quantum critical behavior driven by Hund's rule coupling in quantum antiferromagnets