Paper Title:

Current-Phase Relation of YBa2Cu3O7-X/Nb Unconventional Superconductor Junctions

Periodical Materials Science Forum (Volume 670)
Main Theme Applied Electromagnetic Engineering
Edited by A.G. Mamalis, M. Enokizono and A. Kladas
Pages 38-41
DOI 10.4028/www.scientific.net/MSF.670.38
Citation Boris Chesca et al., 2010, Materials Science Forum, 670, 38
Online since December, 2010
Authors Boris Chesca, Henk Jan Smilde, Hans Hilgenkamp
Keywords Low Temperature Electric, Thin Film Superconducting Cuprate Junction, Transport Measurement, Unconventional Superconductivity
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Abstract

The knowledge of the current-phase relation (CPR) in superconducting junctions is essential in many applications like low-dissipative superconducting electronics or superconducting qubits for quantum computation. Theory predicts that unconventional superconductivity induces a significant second harmonic J2 in the CPR. Consequently, anomalies such as half-integer Shapiro steps should be observed in the microwave assisted current-voltage characteristics of the junctions. We performed electric transport measurements in YBa2Cu3O7-x/Nb unconventional superconductor junctions for 72 different tunneling directions in the ab plane and found no trace of such anomalies. This suggest that J2 is insignificantly small so that YBa2Cu3O7-x/Nb junctions have a purely sinusoidal CPR.