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High bias anomaly in YBa2Cu3O7-x/LaMnO3+delta/YBa2Cu3O7-x superconductor/ferromagnetic insulator/superconductor junctions: Evidence for a long-range superconducting proximity effect through the conduction band of a ferromagnetic insulator
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 87, no 13, 134520- p.Article in journal (Refereed) Published
Abstract [en]

We study the perpendicular transport characteristics of small superconductor/ferromagnetic insulator/superconductor (YBa2Cu3O7-x/LaMnO3+delta/YBa2Cu3O7-x) tunnel junctions. At a large bias voltage V similar to 1 V we observe a steplike onset of excess current that occurs below the superconducting transition temperature T < T-c and is easily suppressed by a magnetic field. The phenomenon is attributed to a different type of the superconducting proximity effect of nonequilibrium electrons injected into the conduction band of the ferromagnetic insulator via a Fowler-Nordheim tunneling process. The occurrence of a strongly nonequilibrium population is confirmed by the detection of photon emission at large bias voltage. Since the conduction band in our ferromagnetic insulator is strongly spin polarized, the long range (20 nm) of the observed proximity effect provides evidence for an unconventional spin-triplet superconducting state.

Place, publisher, year, edition, pages
2013. Vol. 87, no 13, 134520- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-91174DOI: 10.1103/PhysRevB.87.134520ISI: 000318507200005OAI: oai:DiVA.org:su-91174DiVA: diva2:631841
Funder
Swedish Research Council
Note

AuthorCount:8;

Available from: 2013-06-24 Created: 2013-06-24 Last updated: 2017-12-06Bibliographically approved

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Golod, TarasRydh, AndreasKrasnov, Vladimir M.
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