Defect scattering in high Tc and colossal magnetoresistive tunnel junctions

J. N. Eckstein, J. O'Donnell, Seongshik Oh, A. E. Andrus, M. Warusawathana, E. Bertram, Bruce A. Davidson, I. Bozovic

Research output: Contribution to journalConference articlepeer-review


Disorder causes both superconducting cuprate and colossal magnetoresistive manganite based tunnel junctions to depart from properties based solely on the superconductivity or magnetism inherent in the materials. Amorphous barrier layers cause diffuse reflection of quasiparticle states at the insulator-superconductor interface, resulting in a local quenching of the d-wave order parameter. A subdominant order parameter evolves at low temperatures in these layers. In manganites, interface disorder reduces spin polarization and causes the tunneling magnetoresistance in spin valve devices to be smaller than in junctions with less disorder.

Original languageEnglish (US)
Pages (from-to)184-189
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue number1
StatePublished - Jun 2000
Event9th Japan-US Workshop on High-Tc Superconductors - Yamanashi, Jpn
Duration: Oct 13 1999Oct 15 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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