Please use this identifier to cite or link to this item: https://doi.org/10.1038/srep25455
Title: Controlling Kondo-like Scattering at the SrTiO3-based Interfaces
Authors: Han, K 
Palina, N
Zeng, S.W 
Huang, Z 
Li, C.J 
Zhou, W.X 
Wan, D.-Y 
Zhang, L.C 
Chi, X 
Guo, R 
Chen, J.S 
Venkatesan, T 
Rusydi, A 
Ariando, NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore, Department of Physics, National University of Singapore, Singapore, 117542, Singapore, National University of Singapore Graduate School for Integrative Sciences and Engineering (NGS), 28 Medical Drive, Singapore, 117456, Singapore 
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: Han, K, Palina, N, Zeng, S.W, Huang, Z, Li, C.J, Zhou, W.X, Wan, D.-Y, Zhang, L.C, Chi, X, Guo, R, Chen, J.S, Venkatesan, T, Rusydi, A, Ariando, NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore, Department of Physics, National University of Singapore, Singapore, 117542, Singapore, National University of Singapore Graduate School for Integrative Sciences and Engineering (NGS), 28 Medical Drive, Singapore, 117456, Singapore (2016). Controlling Kondo-like Scattering at the SrTiO3-based Interfaces. Scientific Reports 6 : 25455. ScholarBank@NUS Repository. https://doi.org/10.1038/srep25455
Abstract: The observation of magnetic interaction at the interface between nonmagnetic oxides has attracted much attention in recent years. In this report, we show that the Kondo-like scattering at the SrTiO3-based conducting interface is enhanced by increasing the lattice mismatch and growth oxygen pressure PO2. For the 26-unit-cell LaAlO3/SrTiO3 (LAO/STO) interface with lattice mismatch being 3.0%, the Kondo-like scattering is observed when PO2 is beyond 1 mTorr. By contrast, when the lattice mismatch is reduced to 1.0% at the (La0.3Sr0.7)(Al0.65Ta0.35)O3/SrTiO3 (LSAT/STO) interface, the metallic state is always preserved up to PO2 of 100 mTorr. The data from Hall measurement and X-ray absorption near edge structure (XANES) spectroscopy reveal that the larger amount of localized Ti3+ ions are formed at the LAO/STO interface compared to LSAT/STO. Those localized Ti3+ ions with unpaired electrons can be spin-polarized to scatter mobile electrons, responsible for the Kondo-like scattering observed at the LAO/STO interface. © 2016, Nature Publishing Group. All rights reserved.
Source Title: Scientific Reports
URI: https://scholarbank.nus.edu.sg/handle/10635/174972
ISSN: 20452322
DOI: 10.1038/srep25455
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