Collective magnetic excitations of $C_{4}$ symmetric magnetic states in iron-based superconductors

11 Aug 2016 Scherer Daniel D. Eremin Ilya Andersen Brian M.

We study the collective magnetic excitations of the recently discovered $C_{4}$ symmetric spin-density wave states of iron-based superconductors with particular emphasis on their orbital character based on an itinerant multiorbital approach. This is important since the $C_{4}$ symmetric spin-density wave states exist only at moderate interaction strengths where damping effects from a coupling to the continuum of particle-hole excitations strongly modifies the shape of the excitation spectra compared to predictions based on a local moment picture... (read more)

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