Microwave flux-flow Hall effect in a multi-band superconductor FeSe

TL;DR

This study investigates the flux-flow Hall effect in FeSe, a multi-band superconductor, revealing unique vortex dynamics and partial cancellation effects due to electron and hole contributions.

Contribution

It provides the first detailed measurement of flux-flow Hall effect in FeSe, highlighting the multi-band nature's influence on vortex behavior and Hall response.

Findings

Flux-flow Hall angle is about 0.5 at low temperatures.

Partial cancellation of Hall voltage by electrons and holes.

Distinct vortex dynamics compared to cuprate superconductors.

Abstract

We have measured the flux-flow Hall effect in a multi-band superconductor FeSe pure single crystal to investigate the nature of the vortex core state by means of the cross-shaped bimodal cavity technique. We found that the flux-flow Hall angle of FeSe at low temperatures is about 0.5, which is equal to or smaller than that evaluated by the effective viscous drag coefficient measurements. This feature is in contrast to the cuprate superconductors. The conductivity tensor of multi-band superconductors that are contributed from holes and electrons shows partial cancellation of the flux-flow Hall voltage by the electrons and holes, wchich can explain the observed feature. Therefore, our study suggests the appearance of the multi-band nature in the vortex dynamics.