Anisotrophic currents and flux jumps in high-T-c superconducting films with self-organized arrays of planar defects

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Regular arrays of planar defects with a period of a few nanometers can be introduced in superconducting YBa2Cu3O7-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 NdGaO3 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 degrees <theta <14 degrees the magnetic flux propagates along the easy channels intermittently, i.e. in a form of flux jumps. This behavior is indicative of thermo-magnetic instability in superconductors, but we argue that this effect can be of a different nature.
Original languageEnglish
JournalPhysica C: Superconductivity and its Applications
Publication date2010
Volume470
Issue19
Pages799-802
ISSN0921-4534
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 4

Keywords

  • Intermittency, Anisotropic critical currents, Flux jumps, Tilted substrates
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