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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Quantum computers
Current voltage characteristics
Superconductivity
Superconducting materials
Electronic equipment
Microwaves
anomalies
quantum computation
integers
superconductivity
harmonics
microwaves
barium copper yttrium oxide
electric potential
electronics
Direction compound

Keywords

  • METIS-283721

Cite this

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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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Current-phase relation of YBa(2)Cu(3)O(7-x)/Nb unconventional superconductor junctions. / Chesca, B.; Smilde, H.J.H.; Hilgenkamp, Johannes W.M.

In: Materials science forum, Vol. 670, 2011, p. 38-41.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Current-phase relation of YBa(2)Cu(3)O(7-x)/Nb unconventional superconductor junctions

AU - Chesca, B.

AU - Smilde, H.J.H.

AU - Hilgenkamp, Johannes W.M.

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.

KW - METIS-283721

U2 - 10.4028/www.scientific.net/MSF.670.38

DO - 10.4028/www.scientific.net/MSF.670.38

M3 - Article

VL - 670

SP - 38

EP - 41

JO - Materials science forum

JF - Materials science forum

SN - 0255-5476

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