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YB 2012
Abstract:
Motivated by iron-based superconductors, we develop a self-consistent electronic theory for the itinerant spin excitations in the regime of coexistence of the antiferromagnetic stripe order with wave vector Q(1) = (pi, 0) and s(+-) superconductivity. The onset of superconductivity leads to the appearance of a magnetic resonance near the wave vector Q(2) = (0, pi), where magnetic order is absent. This resonance is isotropic in spin space, unlike the excitations near Q(1), where the magnetic Goldstone mode resides. We discuss several features which can be observed experimentally.
