A possibility of persistent voltage observation in a system of asymmetric superconducting rings

TL;DR

This study explores the potential to observe persistent voltage in asymmetric superconducting rings, especially near the transition temperature where thermal fluctuations influence the system, expanding understanding of quantum effects in superconductors.

Contribution

It demonstrates the experimental feasibility of detecting persistent voltage in asymmetric rings near the superconducting transition, highlighting the influence of thermal fluctuations on quantum phenomena.

Findings

Persistent voltage can be observed near the transition temperature.

Thermal fluctuations induce switching of ring segments.

Quantum oscillations are detectable in systems with many rings.

Abstract

A possibility to observe the persistent voltage in a superconducting ring of different widths of the arms is experimentally investigated. It was earlier found that switching of the arms between superconducting and normal states by ac current induces the dc voltage oscillation in magnetic field with a period corresponding to the flux quantum inside the ring. We use systems with a large number of asymmetric rings connected in series in order to investigate the possibility to observe this quantum phenomenon near the superconducting transition where thermal fluctuations switch ring segments without external influence and the persistent current is much smaller than in the superconducting state.