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Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures

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.

preprint2012arXivOpen access
E. FlekserM. Ben ShalomM. KimC. BellY. HikitaH. Y. HwangY. Dagan
cond-mat.mes-hallcond-mat.supr-concond-mat.str-el
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E. FlekserM. Ben ShalomM. KimC. BellY. HikitaH. Y. HwangY. Dagan

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