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.
@article{arxiv.1207.6057,
title = {Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures},
author = {E. Flekser and M. Ben Shalom and M. Kim and C. Bell and Y. Hikita and H. Y. Hwang and Y. Dagan},
journal= {arXiv preprint arXiv:1207.6057},
year = {2015}
}