Figure 4
From: Anisotropic resonance modes emerging in an antiferromagnetic superconducting state
Polarization of resonance signals in 6% and in 4.5% Co-doped BaFe2 As2. l dependence of the scattering in various SF channels which allows one to separate the \({\chi^{\prime\prime}}_{long}\) and \({\chi^{\prime\prime}}_{t-out}\) components in the SFz channel. The parameter p describes the contribution of \({\chi^{\prime\prime}}_{t-out}\) required to fit the l dependence. Panel (a) shows the low temperature results for the 4 meV signal in optimum doped Ba(Fe0.94 Co0.06)2 As2, which has no t − in component but consists of 29% of long signal. In contrast, the isotropic resonance at ∼ 8 meV appears equally strong, p = 0.5, in the three directions (b). Panels (c–k) present the same analysis in Ba(Fe0.955 Co0.045)2 As2 for energies of 3, 5 and 7.5 meV, when not labelled differently, at T = 1.5 K in the SC state, at 15 K in the non-SC AFM phase, and at 58 K in the paramagnetic phase.
