Interface resistance of YBa2Cu3O7−δ/La0.67Sr0.33MnO3 ramp-type contacts

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Abstract

We fabricated and characterized YBa2Cu3O7−δ/La0.67Sr0.33MnO3 (YBCO/LSMO) ramp-type contacts and junctions. An interlayer technique was applied to repair the ramp stoichiometry after etching. It was found that, typically, the resistance of the YBCO/LSMO interface is high compared to the resistances of YBCO interfaces to Au, Pt and the epitaxially grown ferromagnetic oxide SrRuO3. The YBCO/LSMO interfaces were characterized electrically and were found to show a large negative, linear magnetoresistance. Electron energy loss spectroscopy experiments do not show a significant oxygen depletion near the YBCO/LSMO interface. Our results indicate that the high interfacial resistance is caused by the effect of charge transfer across the interface. The magnetoresistance suggests that part of the interface resistance is of magnetic origin.
Original languageUndefined
Pages (from-to)134513
JournalPhysical review B: Condensed matter and materials physics
Volume82
Issue number13
DOIs
Publication statusPublished - 2010

Keywords

  • IR-73999

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