New Vortex with Zero Fluxoid Quantum in a Superconductor Anomalous Hall Effect in High T_c and Low T_c Superconductors

TL;DR

This paper introduces a new vortex with zero fluxoid quantum in superconductors, explaining anomalous Hall effects and flux domain structures in high and low T_c materials.

Contribution

It identifies a novel vortex type with zero fluxoid quantum and explains its role in flux domain formation and Hall effect sign changes.

Findings

Discovery of a vortex with zero fluxoid quantum (VZF).

VZF acts as a domain wall between flux and antiflux regions.

The Hall effect sign depends on the relative contributions of different vortices.

Abstract

It is shown that there are three kinds of vortices in a superconductor; a vortex with the fluxoid quantum 1 (VF), a new vortex with 0 (VZF), and a vortex with -1 (VAF), respectively. The Hall field via three vortices is studied and found to change its sign, depending of the relative strength of contributions via VF and VAF, similar to that of a system with two kinds of carriers. VZF is suggested to act as a domain wall between VF and VAF regions, accounting for the flux and antiflux regions observed in Nb films.