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Splitting of resonance excitations in nearly optimally doped Ba(Fe0.94Co0.06)2As2: an inelastic neutron scattering study with polarization analysis

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arxiv 1210.6386 v1 pith:W3LCLWTL submitted 2012-10-23 cond-mat.supr-con

Paul Steffens , C. H. Lee , N. Qureshi , K. Kihou , A. Iyo , H. Eisaki , M. Braden This is my paper
classification cond-mat.supr-con
keywords excitationsresonancescatteringfindinelasticneutronsuperconductingabove
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Magnetic excitations in Ba(Fe0.94Co0.06)2As2 are studied by polarized inelastic neutron scattering (INS) above and below the superconducting transition. In the superconducting state we find clear evidence for two resonance-like excitations. At a higher energy of about 8 meV there is an isotropic resonance mode with weak dispersion along the c-direction. In addition we find a lower excitation at 4 meV that appears only in the c-polarized channel and whose intensity strongly varies with the L-component of the scattering vector. These resonance excitations behave remarkably similar to the gap modes in the antiferromagnetic phase of the parent compound BaFe2As2.

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