Spin-polarized transport across a La0.7Sr0.3MnO3/YBa2Cu3O7−x interface: Role of Andreev bound states

Z. Y. Chen, Amlan Biswas, Igor Žutić, Tao Wu, S. B. Ogale, R. L. Greene, T. Venkatesan

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Transport across an La0.7Sr0.3MnO3/YBa2Cu3O7−x (LSMO/YBCO) interface is studied as a function of temperature and surface morphology. For comparison, control measurements are performed in nonmagnetic heterostructures of LaNiO3/YBCO and Ag/YBCO. In all cases, YBCO is used as bottom layer to eliminate the channel resistance and to minimize thermal effects. The observed differential conductance reflects the role of Andreev bound states in the a−b plane, and displays the suppression of such states by the spin-polarized transport across the interface. The theoretical analysis of the measured data reveals decay of the spin polarization near the LSMO surface with temperature, consistent with the reported photoemission data.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number21
DOIs
StatePublished - May 7 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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