Controlled suppression of local magnetization hysteresis by dc in-plane field in Bi2Sr2CaCu2O8

TL;DR

This study demonstrates that applying a dc in-plane magnetic field can suppress local magnetization hysteresis in Bi2Sr2CaCu2O8 by primarily reducing the geometrical barrier, especially at high temperatures and low fields.

Contribution

It reveals that a dc in-plane field suppresses hysteresis mainly through geometrical barrier reduction in high-temperature, low-field regimes of Bi2Sr2CaCu2O8.

Findings

DC in-plane field suppresses magnetization hysteresis.

Suppression occurs mainly via geometrical barrier reduction.

Effect is prominent at high temperatures and low fields.

Abstract

Local magnetization hysteresis is among the most extensively studied features of high-temperature superconductors (HTSC). The usual source of hysteresis in superconductors is bulk vortex pinning due to material defects. Two additional known mechanisms of magnetic irreversibility are the Bean-Livingston surface barrier and the geometrical barrier (GB). GB arises due to a competition between the line energy of a vortex penetrating into the sample and the Lorentz force of Meissner currents which focuses vortices in the sample's center to form a dome-shaped vortex distribution. This work demonstrates that dc in-plane field overcomes hysteresis mainly through the GB suppression in a region of phase diagram under consideration (high temperatures and low fields).