75 research outputs found
A possibility of persistent voltage observation in a system of asymmetric superconducting rings
A possibility to observe the persistent voltage in a superconducting ring of
different widths of the arms is experimentally investigated. It was earlier
found that switching of the arms between superconducting and normal states by
ac current induces the dc voltage oscillation in magnetic field with a period
corresponding to the flux quantum inside the ring. We use systems with a large
number of asymmetric rings connected in series in order to investigate the
possibility to observe this quantum phenomenon near the superconducting
transition where thermal fluctuations switch ring segments without external
influence and the persistent current is much smaller than in the
superconducting state.Comment: 7 pages, 4 figure
Multiple Current States of Two Phase-Coupled Superconducting Rings
The states of two phase-coupled superconducting rings have been investigated.
Multiple current states have been revealed in the dependence of the critical
current on the magnetic field. The performed calculations of the critical
currents and energy states in a magnetic field have made it possible to
interpret the experiment as the measurement of energy states into which the
system comes with different probabilities because of the equilibrium and
non-equilibrium noises upon the transition from the resistive state to the
superconducting state during the measurement of the critical currentComment: 5 pages, 5 figure
Quantum Oscillations of the Critical Current of Asymmetric Aluminum Loops in Magnetic Field
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.Comment: 2 pages, 2 figures, will be published in the Proceedings of the 24th
International Conference on Low Temperature Physic
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