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

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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.

Item Type: Article
Subjects: Physics
Depositing User: Dr. Rajpal Walke
Date Deposited: 16 Oct 2015 10:05
Last Modified: 16 Oct 2015 10:05
URI: http://npl.csircentral.net/id/eprint/1365

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