Das, Shubhankar and Rastogi, A. and Wu, Lijun and Zheng, Jin-Cheng and Hossain, Z. and Zhu, Yimei and Budhani, R. C.
(2014)
Kondo scattering in delta-doped LaTiO3/SrTiO3 interfaces: Renormalization by spin-orbit interactions.
Physical Review B, 90 (8).
081107-1-081107-5.
ISSN 1098-0121
Abstract
We present a study of delta doping at the LaTiO3/SrTiO3 interface with isostructural antiferromagnetic perovskite LaCrO3 that dramatically alters the properties of the two-dimensional electron gas 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 fields, respectively, and the field and temperature dependencies of MR suggest Kondo scattering by localized Ti3+ 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 of blocking of electron transfer from LTO to STO by the delta layer.
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