Dispersion of the superconducting spin resonance in underdoped and antiferromagnetic BaFe2As2

TitleDispersion of the superconducting spin resonance in underdoped and antiferromagnetic BaFe2As2
Publication TypeJournal Article
Year of Publication2010
AuthorsPratt DK, Kreyssig A, Nandi S, Ni N, Thaler A, Lumsden MD, Tian W, Zarestky JL, Bud'ko SL, Canfield PC, Goldman AI, McQueeney RJ
Journal TitlePhysical Review B
Volume81
Pages140510
Date Published04/01
ISBN Number1098-0121
Accession NumberISI:000277210200029
Keywordst-c, upd2al3
Abstract

Inelastic neutron-scattering measurements have been performed on underdoped Ba(Fe1-xCox)(2)As-2 (x=4.7%) where superconductivity and long-range antiferromagnetic (AFM) order coexist. The magnetic spectrum found in the normal state is strongly damped and develops into a magnetic resonance feature below T-c that has appreciable dispersion along c axis with a bandwidth of 3-4 meV. This is in contrast to the optimally doped x=8.0% composition, with no long-range AFM order, where the resonance exhibits a much weaker dispersion. [see M. D. Lumsden et al., Phys. Rev. Lett. 102, 107005 (2009).] The results suggest that the resonance dispersion arises from interlayer spin correlations present in the AFM ordered state.

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