Observation of the Little-Parks Oscillations in a System of Asymmetric Superconducting Rings

Abstract

Little-Parks oscillations are observed in a system of 110 series-connected aluminum rings 2000 nm in diameter with the use of measuring currents from 10 nA to 1000 nA. The measurements show that the amplitude and character of the oscillations are independent of the relation between the measuring current and the amplitude of the persistent current. By using asymmetric rings, it is demonstrated that the persistent current has clockwise or contra-clockwise direction. This means that the total current in one of the semi-rings may be directed against the electric field at measurement of the Little-Parks oscillations. The measurements at zero and low measuring current have revealed that the persistent current, like the conventional circulating current, causes a potential difference on the semi-rings with different cross sections in spite of the absence of the Faraday's voltage.

arXiv comment5 pages, 6 figures

References in corpus (1)

• Calibration of quantum detector of noise based on a system of asymmetric superconducting loops

Cited by in corpus (14)

• The law of entropy increase and the Meissner effect
• The Meissner effect puzzle and the quantum force in superconductor
• Weak dissipation does not result in disappearance of persistent current
• A possibility of persistent voltage observation in a system of asymmetric superconducting rings
• Dynamic processes in superconductors and the laws of thermodynamics
• Superconducting quantum interference device without Josephson junctions
• Comment on "Vortices induced in a superconducting loop by asymmetric kinetic inductance and their detection in transport measurements"
• Experimental investigations of the problem of the quantum jump with the help of superconductor nanostructures
• Quantum periodicity in the critical current of superconducting rings with asymmetric link-up of current leads
• Multiple superconducting ring ratchets for ultrasensitive detection of non-equilibrium noise
• Belief in thermodynamics has provoked false thermodynamics of superconductors
• Multiple Current States of Two Phase-Coupled Superconducting Rings
• A problem with the conservation law observed in macroscopic quantum phenomena is a consequence of violation of the correspondence principle
• The Meissner effect does not require radial charge flow