Quantum periodicity in the critical current of superconducting rings with asymmetric link-up of current leads

Abstract

We use superconducting rings with asymmetric link-up of current leads for experimental investigation of winding number change at magnetic field corresponding to the half of the flux quantum inside the ring. According to the conventional theory, the critical current of such rings should change by jump due to this change. Experimental data obtained at measurements of aluminum rings agree with theoretical prediction in magnetic flux region close to integer numbers of the flux quantum and disagree in the region close to the half of the one, where a smooth change is observed instead of the jump. First measurements of tantalum ring give a hope for the jump. Investigation of this problem may have both fundamental and practical importance.

8 pages, 5 figures

References in corpus (4)

• Persistent currents in normal metal rings
• Fluctuation Superconductivity in Mesoscopic Aluminum Rings
• Observation of the Little-Parks Oscillations in a System of Asymmetric Superconducting Rings
• Superconducting quantum interference device without Josephson junctions

Cited by in corpus (7)

• Anomalous Fano Resonance in Double Quantum Dot System Coupled to Superconductor
• Experimental investigations of the problem of the quantum jump with the help of superconductor nanostructures
• A development of superconducting differential double contour interferometer
• 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
• Quantum interference in asymmetric superconducting nanowire loops
• The Meissner effect does not require radial charge flow