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
TL;DR
This study compares magnetotransport effects in polar LaAlO3/SrTiO3 and non-polar Nb-doped SrTiO3 heterostructures, revealing the role of Rashba spin-orbit coupling and magnetic scatterers in their distinct behaviors.
Contribution
It provides a detailed analysis of magnetoresistance effects, clarifying the mechanisms involving spin-orbit coupling and magnetic scatterers in different SrTiO3-based heterostructures.
Findings
Strong anisotropic magnetoresistance in LaAlO3/SrTiO3
Effects explained by Rashba spin-orbit coupling and magnetic scatterers
Atomic spin-orbit coupling accounts for effects in Nb-doped SrTiO3
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.
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