Tuning the Two-Dimensional Electron Liquid at Oxide Interfaces by 
Buffer-Layer-Engineered Redox Reactions

Chen, Yunzhong; Green, Robert J.; Sutarto, Ronny; He, Feizhou; Linderoth, Soren; Sawatzky, George A.; Pryds, Nini

doi:10.1021/acs.nanolett.7b03744

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Tuning the Two-Dimensional Electron Liquid at Oxide Interfaces by Buffer-Layer-Engineered Redox Reactions

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Green, Robert J.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Chen, Y., Green, R. J., Sutarto, R., He, F., Linderoth, S., Sawatzky, G. A., et al. (2017). Tuning the Two-Dimensional Electron Liquid at Oxide Interfaces by Buffer-Layer-Engineered Redox Reactions. Nano Letters, 17(11), 7062-7066. doi:10.1021/acs.nanolett.7b03744.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002E-9E73-7

Abstract

Polar discontinuities and redox reactions provide alternative paths to create two-dimensional electron liquids (2DELs) at oxide interfaces. Herein, we report high mobility 2DELs at interfaces involving SrTiO3 (STO) achieved using polar La7/8Sr1/8MnO3 (LSMO) buffer layers to manipulate both polarities and redox reactions from disordered overlayers grown at room temperature. Using resonant X-ray reflectometry experiments, we quantify redox reactions from oxide overlayers on STO as well as polarity induced electronic reconstruction at epitaxial LSMO/STO interfaces. The analysis reveals how these effects can be combined in a STO/LSMO/disordered film trilayer system to yield high mobility modulation doped 2DELs, where the buffer layer undergoes a partial transformation from perovskite to brownmillerite structure. This uncovered interplay between polar discontinuities and redox reactions via buffer layers provides a new approach for the design of functional oxide interfaces.