Vortex states in hole-doped iron-pnictide superconductors

TL;DR

This paper models vortex states in hole-doped iron-pnictide superconductors using a phenomenological approach, revealing how spin-density-wave interactions influence local electronic states and aligning with experimental observations.

Contribution

It introduces a phenomenological model to study vortex states in Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ and elucidates the impact of SDW on local density of states.

Findings

Qualitative agreement with STM experiments for optimally doped compounds.

SDW reduces in-gap peak intensity and redistributes spectral weight.

Main effects of SDW are captured through the model's spectral analysis.

Abstract

Based on a phenomenological model with competing spin-density-wave (SDW) and extended $s-$wave superconductivity, the vortex states in Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ are investigated by solving Bogoliubov-de Gennes equations. Our result for the optimally doped compound without induced SDW is in qualitative agreement with recent scanning tunneling microscopy experiment. We also propose that the main effect of the SDW on the vortex states is to reduce the intensity of the in-gap peak in the local density of states and transfer the spectral weight to form additional peaks outside the gap.