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



Autor: R.A.
Ewings, T.G.
Perring, R.I.
Bewley, T.
Guidi, M.J.
Pitcher, D.R.
Parker, S.J.
Clarke, A.T.
Boothroyd


Fuente: https://arxiv.org/



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