Anisotrophic currents and flux jumps in high-T sub()csuperconducting films with self-organized arrays of planar defects

Regular arrays of planar defects with a period of a few nanometers can be introduced in superconducting YBa sub(2)Cu sub(3)O sub(7-) delta (YBCO) thin films by depositing them on vicinal (also called miscut or tilted) substrates. This results in the anisotropy of critical currents flowing in the pla...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2010-10, Vol.470 (19), p.799-802
Main Authors: Yurchenko, V V, Qviller, A J, Mozhaev, P B, Mozhaeva, JE, Hansen, J B, Jacobsen, C S, Kotelyanskii, I M, Pan, A V, Johansen, TH
Format: Article
Language:English
Subjects:
ANISOTROPY
Arrays
COPPER OXIDE
DEFECTS
DEPOSITION
Dynamics
Flux
FLUXES
SUPERCONDUCTORS
THIN FILMS
YBCO superconductors
YTTRIUM OXIDE
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Summary:Regular arrays of planar defects with a period of a few nanometers can be introduced in superconducting YBa sub(2)Cu sub(3)O sub(7-) delta (YBCO) thin films by depositing them on vicinal (also called miscut or tilted) substrates. This results in the anisotropy of critical currents flowing in the plane of the film. We present results of real-time magneto-optical imaging (MOI) of magnetic flux distribution and dynamics in a series of YBCO thin films deposited on NdGaO sub(3) substrates with different miscut angles [theta]. MOI allows reconstructing the current flow profiles. From the angle formed between domains with different directions of the current flow we determine the anisotropy parameter of the in-plane current, as well as its field and temperature dependences. The artificially introduced defects also have a dramatic effect on the dynamics of the flux propagation: for 10 degree
ISSN:0921-4534
DOI:10.1016/j.physc.2010.02.085