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

Boris Chesca; Henk Jan Smilde; Hans Hilgenkamp

doi:10.4028/www.scientific.net/MSF.670.38

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

Boris Chesca
, Henk Jan Smilde
, Hans Hilgenkamp

Interfaces and Correlated Electron Systems

Research output: Contribution to journal › Article › Academic › peer-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 language	English
Pages (from-to)	38-41
Number of pages	4
Journal	Materials science forum
Volume	670
DOIs	https://doi.org/10.4028/www.scientific.net/MSF.670.38
Publication status	Published - 2011

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METIS-283721

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10.4028/www.scientific.net/MSF.670.38

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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.",

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AU - Smilde, Henk Jan

AU - Hilgenkamp, Hans

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

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JO - Materials science forum

JF - Materials science forum

ER -

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

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