Detection of self-oscillations of the transport current in a doubly connected superconductor

TL;DR

This paper experimentally investigates self-oscillations in a doubly connected superconductor circuit, revealing how critical current thresholds induce undamped quasi-harmonic oscillations and examining magnetic field freezing effects.

Contribution

It provides new experimental insights into the mechanism of self-oscillations and magnetic behavior in superconducting circuits with parallel branches.

Findings

Self-oscillations occur when critical current is reached in one branch.

Oscillations are quasi-harmonic and undamped.

Magnetic field freezing characteristics are analyzed.

Abstract

It has been found experimentally that when dc current is passed through a circuit consisting of two superconductors connected in parallel and reaches its critical value in one of the circuit branches the current in the branches undergoes quasi-harmonic undamped oscillations. The mechanism resulting in the appearance of the self-oscillations is discussed. The characteristics of magnetic field freezing in a circuit with self-oscillating current are examined.