High energy spin excitations in BaFe2As2

Details High energy spin excitations in BaFe2As2 High energy spin excitations in BaFe2As2

2008-08-21

arxiv.org/abs/0808.2836v2

Phys. Rev. B 78, 220501(R) (2008)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.78.220501

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.

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