2010/02/17 by D. K. Pratt, A. Kreyssig, A. Kreyßig +13
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.81.140510
published as Phys. Rev. B 81, 140510(R) (2010)
arxiv created 2010/02/17 · openalex publication_date 2010/04/29 · arxiv updated 2010/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Inelastic neutron-scattering measurements have been performed on underdoped Ba(Fe_1\ensuremath-xCox)2As2 (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 Tc 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.