Consistent picture for the electronic structure around a vortex core in iron-based superconductors

TL;DR

This paper presents a theoretical study of the electronic structure around vortex cores in iron-based superconductors, explaining experimental observations and the effects of impurities on vortex pinning and bound states.

Contribution

It introduces a two-orbital model that accounts for impurity effects, providing a consistent explanation for vortex core electronic structures across different materials.

Findings

Bound states appear in unpinned vortices

Impurities wipe out vortex bound states

Vortex pinning occurs near impurities

Abstract

Based on a two-orbital model and taking into account the presence of the impurity, we studied theoretically the electronic structure in the vortex core of the iron-Pnictide superconducting materials. The vortex is pinned when the impurity is close to the vortex core. The bound states shows up for the unpinned vortex and are wiped out by a impurity. Our results are in good agreement with recent experiments and present a consistent explanation for the different electronic structure of vortex core revealed by experiments on different materials.