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Evidence for Nonlocal Electrodynamics in Planar Josephson Junctions
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
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 Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, nr 11, artikkel-id 117002Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We study the temperature dependence of the critical current modulation I-c(H) for two types of planar Josephson junctions: a low-T-c Nb/CuNi/Nb and a high-T-c YBa2Cu3O7-delta bicrystal grain-boundary junction. At low T both junctions exhibit a conventional behavior, described by the local sine-Gordon equation. However, at elevated T the behavior becomes qualitatively different: the I-c(H) modulation field Delta H becomes almost T independent and neither Delta H nor the critical field for the penetration of Josephson vortices vanish at T-c. Such an unusual behavior is in good agreement with theoretical predictions for junctions with nonlocal electrodynamics. We extract absolute values of the London penetration depth lambda from our data and show that a crossover from local to nonlocal electrodynamics occurs with increasing T when lambda(T) becomes larger than the electrode thickness.

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2013. Vol. 111, nr 11, artikkel-id 117002
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URN: urn:nbn:se:su:diva-94861DOI: 10.1103/PhysRevLett.111.117002ISI: 000324308800015Scopus ID: 2-s2.0-84884257143OAI: oai:DiVA.org:su-94861DiVA, id: diva2:656795
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AuthorCount:6;

Tilgjengelig fra: 2013-10-17 Laget: 2013-10-16 Sist oppdatert: 2022-10-06bibliografisk kontrollert

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Boris, Andrey A.Rydh, AndreasGolod, TarasMotzkau, HolgerKrasnov, Vladimir M.

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