Current-phase relation of YBa(2)Cu(3)O(7-x)/Nb unconventional superconductor junctions

B. Chesca, H.J.H. Smilde, Johannes W.M. Hilgenkamp

Research output: Contribution to journalArticleAcademicpeer-review

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.
Original languageEnglish
Pages (from-to)38-41
Number of pages4
JournalMaterials science forum
Volume670
DOIs
Publication statusPublished - 2011

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Keywords

  • METIS-283721

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