Magnetic-field dependence of dynamical vortex response in two-dimensional Josephson junction arrays and superconducting films

TL;DR

This paper investigates how the dynamical vortex response in 2D Josephson junction arrays and superconducting films changes with magnetic field, revealing a crossover from normal to anomalous behavior characterized by a single parameter.

Contribution

It introduces a new understanding of the magnetic-field-induced crossover in vortex dynamics and provides a framework for interpreting impedance measurements.

Findings

Response crosses over from normal to anomalous with increasing magnetic field.

A single dimensionless parameter characterizes the crossover.

Implications for impedance measurements in experiments.

Abstract

The dynamical vortex response of a two-dimensional array of the resistively shunted Josephson junctions in a perpendicular magnetic field is inferred from simulations. It is found that, as the magnetic field is increased at a fixed temperature, the response crosses over from normal to anomalous, and that this crossover can be characterized by a single dimensionless parameter. It is described how this crossover should be reflected in measurements of the complex impedance for Josephson junction arrays and superconducting films.