Investigation of magnetic phases in parent compounds of Iron-chalcogenides via quasiparticle scattering interference

TL;DR

This study uses a five-orbital model and quasiparticle interference to identify and distinguish magnetic phases in iron-chalcogenides, providing a potential experimental tool for magnetic structure detection.

Contribution

It introduces a QPI-based approach to detect and classify magnetic phases in iron-chalcogenides, including unobserved magnetic structures.

Findings

QPI signatures can differentiate between magnetic phases.

The method identifies the double-striped structure with specific ordering vector.

Extended and orthogonal double stripe phases are also characterized.

Abstract

We employ a five-orbital tight-binding model to develop the mean field solution for various possible spin density wave states in the iron-chalcogenides. The quasiparticle interference (QPI) technique is applied to detect signatures of these states due to scatterings arising from non-magnetic impurities. Apart from the experimentally observed double striped structure with ordering vector $(\pi/2,\pi/2)$, the QPI method is investigated for the extended-stripe as well as the orthogonal double stripe phase. We discuss QPI as a possible tool to detect and classify various magnetic structures with different electronic structure reconstruction within framework of the Fe$_{1+y}$Te compound.