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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2002     Display Documents

ID: 7176.0, MPI für Festkörperforschung / FKF Publikationen 2002
Enhanced critical currents by silver sheeting of YBa2Cu3O7-δ thin films
Authors:Kienzle, M.; Albrecht, J.; Warthmann, R.; Kronmüller, H.; Leonhardt, S.; Jooss, C.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Physical Review B
Issue / Number:5
Sequence Number of Article:054525
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Magneto-optical investigation of flux penetration into high-
temperature superconducting thin films allows the determination
of the local critical current density j(c) by an inversion
scheme of Biot-Savart's law. This method is used to examine the
influence of silver sheeting on j(c) in thin films of
YBa2Cu3O7-delta (YBCO) quantitatively. It can be found that a
feasible silver covering layer on top of a YBCO thin film can
enhance the critical current density by up to 50%. Spatially
resolved measurements of the magnetic-flux density distribution
in partly silver covered YBCO films show the influence of the
cover layer on the current pattern in the superconductor. The
measured enhancement of the critical current density, that is
induced by the silver layer, has its origin in a spatially
varying proximity effect between superconductor and silver
layer which leads to a strong variation of the flux-line
energies on a small length scale. This variation is directly
related to an additional pinning force density on the flux
lines. A detailed model is developed that can explain the
measured enhancement of the critical current density by
considering this additional pinning.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Max Planck Inst Met Res, Heisenbergstr 1, D-70569 Stuttgart, Germany
; Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
; Univ Gottingen, Inst Mat Phys, D-37073 Gottingen, Germany
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