Measurement of energy gaps in superconductors by means of quantum interference devices

The effect of temperature on the form of discrete changes in the current in highly inductive (∼10−6 H) doubly-connected superconductors with niobium-niobium clamped point contacts is determined experimentally. The magnitude and duration of the voltage pulse on a doubly-connected superconductor is me...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2015-03, Vol.41 (3), p.179-185
Main Authors: Bondarenko, S. I., Koverya, V. P., Krevsun, A. V., Gnezdilova, L. V.
Format: Article
Language:English
Subjects:
Energy gap
Energy measurement
Interference
Niobium
Temperature effects
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Summary:The effect of temperature on the form of discrete changes in the current in highly inductive (∼10−6 H) doubly-connected superconductors with niobium-niobium clamped point contacts is determined experimentally. The magnitude and duration of the voltage pulse on a doubly-connected superconductor is measured at the time of the discrete change in its current state. The pulse magnitude is close to the energy gap 2Δ/e of the superconductor and its duration (∼10−6 s) corresponds to the minimum possible time (∼10−12 s) for a change in the state of the contact when the depairing current through it is reached. The measurement data are discussed in terms of models of the quantum interference of currents in a doubly-connected superconductor with clamped point contacts in the form of a quantum interferometer.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.4915915