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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
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Vise andre og tillknytning
2013 (engelsk)Inngår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 87, nr 13, s. 134520-Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2013. Vol. 87, nr 13, s. 134520-
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Identifikatorer
URN: urn:nbn:se:su:diva-91174DOI: 10.1103/PhysRevB.87.134520ISI: 000318507200005Scopus ID: 2-s2.0-84876985597OAI: oai:DiVA.org:su-91174DiVA, id: diva2:631841
Forskningsfinansiär
Swedish Research Council
Merknad

AuthorCount:8;

Tilgjengelig fra: 2013-06-24 Laget: 2013-06-24 Sist oppdatert: 2022-10-07bibliografisk kontrollert

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Golod, TarasRydh, AndreasKrasnov, Vladimir M.

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