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.

5 pages, 6 figures

Cited by in corpus (8)

• The law of entropy increase and the Meissner effect
• Dynamic processes in superconductors and the laws of thermodynamics
• Superconducting quantum interference device without Josephson junctions
• 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
• Belief in thermodynamics has provoked false thermodynamics of superconductors
• 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