Spin-wave excitations in the SDW state of doped iron pnictides

Abstract

We investigate the spin-wave excitations in the spin-density wave state of doped iron pnictides within a five-orbital model. We find that the excitations along ($\pi ,0$)$\to$($\pi ,\pi$) are very sensitive to the doping whereas they do not exhibit a similar sensitivity along ($0,0$) $\to$ ($\pi ,0$). Secondly, anisotropy in the excitations around ($\pi ,0$) with an elliptical shape grows on moving towards the hole-doped region for low energy, whereas it decreases for the high-energy excitations on the contrary. Thirdly, spin-wave spectral weight shifts towards the low-energy region on moving away from zero doping. We find these features to be in qualitative agreement with the inelastic neutron-scattering measurements for the doped pnictides.

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Cited by in corpus (1)

• Effect of strain-induced orbital splitting on the magnetic excitations in undoped cuprates