# Spin-wave excitations in the SDW state of iron pnictides: a comparison between the roles of interaction parameters

## TL;DR

This study explores how Hund's coupling influences spin-wave excitations in iron pnictides, revealing its essential role in reproducing experimental features such as anisotropy and spectral weight distribution.

## Contribution

It demonstrates that Hund's coupling is vital for accurately modeling spin-wave excitations in the SDW state of iron pnictides, distinguishing its effects from intraorbital Coulomb interactions.

## Key findings

- Hund's coupling is crucial for reproducing experimental spin-wave features.
- The model captures anisotropy and energy dependence of spin-wave spectra.
- Different interaction parameters significantly affect magnetic excitation characteristics.

## Abstract

We investigate the role of Hund's coupling in the spin-wave excitations of the ($\pi, 0$) ordered magnetic state within a five-orbital tight-binding model for iron pnictides. To differentiate between the roles of intraorbital Coulomb interaction and Hund's coupling, we focus on the self-consistently obtained mean-field SDW state with a fixed magnetic moment obtained by using different sets of interaction parameters. We find that the Hund's coupling is crucial for the description of various experimentally observed characteristics of the spin-wave excitations including the anisotropy, energy-dependent behavior, and spin-wave spectral weight distribution.