title: Controlling Kondo-like Scattering at the SrTiO3-based Interfaces.
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 Ti(3+) ions are formed at the LAO/STO interface compared to LSAT/STO. Those localized Ti(3+) ions with unpaired electrons can be spin-polarized to scatter mobile electrons, responsible for the Kondo-like scattering observed at the LAO/STO interface.
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors.forename: K
authors.initials: K
authors.lastname: Han
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore.
authors.forename: N
authors.initials: N
authors.lastname: Palina
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors.forename: S W
authors.initials: SW
authors.lastname: Zeng
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.
authors.forename: Z
authors.initials: Z
authors.lastname: Huang
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.
authors.forename: C J
authors.initials: CJ
authors.lastname: Li
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors.forename: W X
authors.initials: WX
authors.lastname: Zhou
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors.forename: D-Y
authors.initials: DY
authors.lastname: Wan
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors.forename: L C
authors.initials: LC
authors.lastname: Zhang
authors.affiliation: Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore.
authors.forename: X
authors.initials: X
authors.lastname: Chi
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Department of Material Science &Engineering, National University of Singapore, Singapore 117575, Singapore.
authors.forename: R
authors.initials: R
authors.lastname: Guo
authors.affiliation: Department of Material Science &Engineering, National University of Singapore, Singapore 117575, Singapore.
authors.forename: J S
authors.initials: JS
authors.lastname: Chen
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Department of Physics, National University of Singapore, Singapore 117542, Singapore.|Department of Material Science &Engineering, National University of Singapore, Singapore 117575, Singapore.|Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore.|National University of Singapore Graduate School for Integrative Sciences and Engineering (NGS), 28 Medical Drive, Singapore 117456, Singapore.
authors.forename: T
authors.initials: T
authors.lastname: Venkatesan
authors.affiliation: NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore.|Department of Physics, National University of Singapore, Singapore 117542, Singapore.|Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore.
authors.forename: A
authors.initials: A
authors.lastname: Rusydi
authors.affiliation: 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.
authors.lastname: Ariando