Flux-Cutting in YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ single crystals: Experiment and Phenomenological model

TL;DR

This study investigates flux cutting in YBa₂Cu₃O₇−δ single crystals through experiments and a phenomenological model, revealing a temperature-independent flux cutting current related to sample thickness and vortex correlation.

Contribution

It introduces a phenomenological model explaining flux cutting behavior in YBCO crystals, highlighting the independence of flux cutting current from pinning and sample thickness.

Findings

Flux cutting current is linear with temperature.

Flux cutting current is independent of sample thickness.

Vortex correlation length matches sample thickness at flux cutting.

Abstract

We measured the current induced loss of vortex correlation in YBCO crystals using the pseudo DC flux transformer geometry. We find that the current $I_{cut}$ at which the top and bottom voltage differ is a linear function of temperature independent of pinning. Although the vortex correlation length at $I_{cut}$ coincides with the sample thickness, the experimental data show that $I_{cut}$ is sample thickness independent. The observed behavior with temperature, magnetic field and thickness is described by a phenomenological model.