High energy spin excitations in BaFe2As2
Autor: | Ewings, R. A., Perring, T. G., Bewley, R. I., Guidi, T., Pitcher, M. J., Parker, D. R., Clarke, S. J., Boothroyd, A. T. |
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Rok vydání: | 2008 |
Předmět: | |
Zdroj: | Phys. Rev. B 78, 220501(R) (2008) |
Druh dokumentu: | Working Paper |
DOI: | 10.1103/PhysRevB.78.220501 |
Popis: | 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. Comment: 4 pages, 4 figures; v2: minor changes to the text and abstract and more general expressions for the linear spin-wave cross section included |
Databáze: | arXiv |
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