Excitation of plasma oscillations by moving Josephson vortices in layered superconductors

TL;DR

This paper models how moving Josephson vortices in layered superconductors excite plasma oscillations, affecting electrical properties and generating electromagnetic radiation, with implications for superconductor dynamics and applications.

Contribution

It provides an exactly solvable model describing plasma oscillation excitation by moving vortices and its impact on flux flow resistivity and electromagnetic emission.

Findings

Large peaks in electromagnetic spectrum due to plasma oscillations and Cherenkov radiation.

Regions of negative differential conductivity where vortex motion becomes unstable.

Modification of flux flow resistivity at high vortex velocities.

Abstract

In the frame of an exactly solvable model we calculate electric and magnetic fields created by uniformly moving lattice of Josephson vortices driven by the transport current in the magnetic field parallel to conducting layers. The distribution of fields and currents is strongly modified at large velocities of the vortex lattice, plasma oscillations of superconducting electrons being excited by flux flow at low temperatures. This modifies the flux flow resistivity and results in interference features in I-V curves, thus regions of negative differential conductivity appear in which the uniform motion of the vortex lattice is not stable. The spectrum of electromagnetic radiation by moving vortices contains large peaks related to the excitation of plasma oscillations and to the Cherenkov radiation.