Enhanced spin-orbit interaction and Kondo scattering in $\delta$-doped LaTiO${}_3$/SrTiO${}_3$ interfaces

Abstract

We present a study of delta ($\delta$) doping at LaTiO${}_3$/SrTiO${}_3$ (LTO/STO) interface with iso-structural antiferromagnetic perovskite LaCrO${}_3$ (LCO) that dramatically alters the properties of the two dimensional electron gas (2-DEG) at the interface. The effects include a reduction in sheet-carrier density, prominence of the low temperature resistivity minimum, enhancement of weak antilocalization below 10 K and observation of a strong anisotropic magnetoresistance (MR). The positive and negative MR for out-of-plane and in-plane field respectively and the field and temperature dependencies of MR suggest Kondo scattering by localized Ti${}^{3+}$ moments renormalized by spin-orbit interaction at T $<$ 10 K, with the increased $\delta$-layer thickness. Electron energy loss spectroscopy and density functional calculations provide convincing evidence for blocking of electron transfer from LTO to STO by the $\delta$-layer.

6 pages, 4 figures, To be appear in Phys. Rev. B (Rapid Communication)

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• Enhanced spin-orbit coupling and charge carrier density suppression in LaAl1-xCrxO3/SrTiO3 heterointerfaces
• Signature of enhanced spin-orbit interaction in the magnetoresistance of LaTiO${}_3$/SrTiO${}_3$ interfaces on $\delta$-doping
• Engineered Kondo screening and nonzero Berry phase in SrTiO3/LaTiO3/SrTiO3 heterostructures
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• Magnetothermopower of $\delta$-doped LaTiO${}_3$/SrTiO${}_3$ interfaces in the Kondo regime
• Inhomogeneous superconductivity and quasilinear magnetoresistance at amorphous LaTiO3/SrTiO3 interfaces
• Growth-Temperature Dependence of Conductivity at the LaCrO${}_3$/SrTiO${}_3$ (001) Interface
• Anisotropic magnetotransport in LaAlO${}_3$/SrTiO${}_3$ nanostructures
• Magnetism and nonlinear charge transport in NiFe2O4/γ-Al2O3/SrTiO3 heterostructure: Toward Spintronic Applications
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