Anomalous behavior of the Hall effect in electron-doped superconductor $Nd_{2-x}$Ce_{x}Cu$O_{4+{\delta}} with nonstoichiometric disorder

TL;DR

This study investigates the anomalous Hall effect behavior in electron-doped Nd2-xCexCuO4+δ superconductors with varying oxygen content, revealing unusual magnetotransport properties linked to vortex dynamics and disorder.

Contribution

It provides new insights into the Hall effect anomalies in electron-doped cuprates, considering nonstoichiometric disorder and vortex back-flow effects.

Findings

Anomalous Hall effect observed in electron-doped cuprates.

Flux-flow model with vortex back-flow explains resistivity and Hall coefficient behavior.

Oxygen content influences vortex pinning and transport properties.

Abstract

Magnetoresistivity and Hall effect measured in magnetic fields up to B=9T (B||c, J||ab) in electron-doped $Nd_{2-x}$Ce_{x}Cu$O_{4+{\delta}} single crystal films with x = 0.14; 0.15; 0.18 and different oxygen content ({\delta}) were studied in a temperature range of 0.4-4.2 K. The resistivity and Hall coefficient behaviors in the mixed state are discussed in the framework of flux-flow model with the inclusion of the back-flow of vortices owing to the pinning forces.