Regular Article

Evidence for the movement of macro-vortices on high critical temperature superconductors

Departamento de Física Aplicada, Universidad de Vigo, As Lagoas s/n, 32004 Ourense, Spain

^a e-mail: gbriones@uvigo.es

Received: 11 April 2016
Revised: 3 July 2016
Accepted: 23 August 2016
Published online: 10 October 2016

Abstract

In this work, a procedure for inserting currents in rings and their respective vortices was developed. The current circulating around the ring was determined by measuring the magnetic field in its axis. Current and vortices were separated by eliminating the current using a resistor placed in the section through which the whole current circulates. The vortices undergo a Lorentz force traveling over the superconducting net and it dissipate energy. This movement is interrupted by the obstacles found on their way (pinning) and can be seen on the decaying curves especially toward the end of the experiment when the forces get weaker due to the decreasing vortices. This movement of vortices was evidenced by resorting to a long time, during which the vortices have come to a stop. The vortices amount was manipulated by means of the injection of anti-vortices that allowed us to eliminate part of them. This allowed us to observe the decrease in travel speed and the dissipation of energy.