Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures

E. Flekser*, M. Ben Shalom, M. Kim, C. Bell, Y. Hikita, H. Y. Hwang, Y. Dagan, Chris Bell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Citations (Scopus)

Abstract

Anisotropic magnetoresistance and negative magnetoresistance for in-plane fields are compared for the LaAlO3/SrTiO3 interface and the symmetric Nb-doped SrTiO3 heterostructure. Both effects are exceptionally strong in LaAlO3/SrTiO3. We analyze their temperature, magnetic field, and gate voltage dependencies and find them to arise from a Rashba-type spin-orbit coupling with magnetic scatterers that have two contributions to their potential: spin exchange and Coulomb interaction. Atomic spin-orbit coupling is sufficient to explain the small effects observed in Nb-doped SrTiO3. These results clarify contradicting transport interpretations in SrTiO3 based heterostructures.

Original languageEnglish
Article number121104
Number of pages5
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume86
Issue number12
DOIs
Publication statusPublished - 11 Sep 2012

Keywords

  • LAALO3/SRTIO3 INTERFACE
  • ELECTRON-GAS
  • SUPERCONDUCTIVITY
  • FERROMAGNETISM
  • COEXISTENCE
  • SURFACE
  • OXIDES
  • FIELD
  • STATE

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