Atomic Resolutin Study of Charge Transfer at the LaTiO<sub>3</sub>/LaFeO<sub>3 </sub>Interface

ORAL

Abstract

Charge transfer at complex oxide interfaces can give rise to a rich variety of exotic two-dimensional phenomena. Recently, an antiferromagnetic to nonmagnetic transition was reported at the LaTiO3/LaFeO3 interface based on the observation of Ti and Fe valence change by X-ray photoelectron spectroscopy. Nonetheless, a direct spatially resolved measurement with atomic resolution to support the charge transfer truly happens at the interface is lacking. Here, we investigate the valence variations of Ti and Fe at the LaTiO3/LaFeO3 interface by a combination of molecular beam epitaxy and aberration corrected scanning transmission electron microscopy. We demonstrate that the charge transfer from Ti to Fe occurs near the interface accompanied by minor cation intermixing, and the charge transfer depth is two unit cells. Our work provides a spatially resolved observation of charge transfer at this interface, and lends significant credence to charge transfer designs in functional oxide interfaces.

*National Basic Research Program of China (Grant No.2015CB654901)
National Natural Science Foundation of China (11474147, 11874199, 11574135)
Natural Science Foundation of Jiangsu Province (Grant No.BK20151383)
Fundamental Research Funds for the Central Universities (No.020514380136, No.021314380058)

–

Presenters

  • Chenyi Gu

    • College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University

Authors

  • Chenyi Gu

    • College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University

  • Min Gu

    • College of Engineering and Applied Sciences, Nanjing University
    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University

  • Zhoushen Yuan

    • College of Engineering and Applied Sciences, Nanjing University

  • Yuefeng Nie

    • College of Engineering and Applied Sciences, Nanjing University
    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University
    • National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing Univ

  • Peng Wang

    • College of Engineering and Applied Sciences, Nanjing University
    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University

  • Xiaoqing Pan

    • Department of Physics and Astronomy, University of California, Irvine
    • Department of Chemical Engineering and Materials Science and Department of Physics and Astronomy, University of California, Irvine