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

## TL;DR

This paper studies how spin-wave excitations in doped iron pnictides' SDW state vary with doping, revealing sensitivity patterns, anisotropy changes, and spectral weight shifts consistent with neutron scattering experiments.

## Contribution

It provides a detailed analysis of doping-dependent spin-wave excitations in a five-orbital model, highlighting new anisotropy and spectral weight behaviors.

## Key findings

- Excitations along ($, 0$) are highly doping-sensitive.
- Anisotropy around ($, 0$) grows with hole doping at low energy.
- Spectral weight shifts to low energy with increased doping.

## 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 ($\pi, 0$)$\rightarrow$($\pi, \pi$) are very sensitive to the doping whereas they do not exhibit a similar sensitivity along ($0, 0$) $\rightarrow$ ($\pi, 0$). 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.