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.
Rok vydání:	2008
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
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
Externí odkaz:	http://arxiv.org/abs/0808.2836 Zobrazit plný text záznamu View this record from Arxiv