Quantum Oscillations of the Critical Current of Asymmetric Aluminum Loops in Magnetic Field

TL;DR

This paper experimentally investigates quantum oscillations in the critical current of asymmetric aluminum superconducting loops under magnetic fields, explaining their origin and calculating persistent currents at various fluxes and temperatures.

Contribution

It provides new experimental data on quantum oscillations in asymmetric superconducting loops and offers a theoretical explanation for their origin related to rectification effects.

Findings

Quantum oscillations of critical current observed in aluminum loops.

Periodical dependencies of critical current on magnetic flux established.

Persistent currents calculated at different flux values and temperatures.

Abstract

The periodical dependencies in magnetic field of the asymmetry of the current-voltage curves of asymmetric aluminum loop are investigated experimentally at different temperatures below the transition into the superconducting state T < Tc. The obtained periodical dependencies of the critical current on magnetic field allow to explain the quantum oscillations of the dc voltage as consequence of the rectification of the external ac current and to calculate the persistent current at different values of magnetic flux inside the loop and temperatures.