2016/05/05 by Kun Han, K. Han, Natalia Palina +23 · 39 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Electron #Electronic and Structural Properties of Oxides #Ion #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Materials science #Optics #Physics #Scattering #Semiconductor materials and devices #Spectroscopy #Unpaired electron #XANES #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1038/srep25455
published in Scientific Reports 6(1), 25455 (Nature Portfolio) · 25 pages, 5 figure
openalex publication_date 2016/05/05 · arxiv created 2016/05/13 · arxiv updated 2016/05/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.