Acoustoelectric effect in strongly correlated oxides

ORAL

Abstract

The acoustoelectric (AE) effect, which manifests itself as the generation of a DC current by a propagating acoustic wave, may convey crucial information on the interdependence between the structural and electronic properties of strongly correlated oxides. We observed that acoustic waves may be coupled not only to an electronic but also to a magnonic state of these materials. In this work, we studied the AE effect in non-magnetic (VO2, V2O3) and ferromagnetic La0.7Sr0.3MnO3 wires grown on top of piezoelectric LiNbO3 substrates. It was observed that the resistance change across a metal-insulator transition results in a significant enhancement of the AE current in the vanadates wires. Additionally, we show that the sign of the AE current differs for excitations produced by bulk and surface acoustic waves. Importantly, it was observed that the AE current in the La0.7Sr0.3MnO3 wire can be significantly tuned by applying an external magnetic field. Our work provides a new platform for surface acoustic wave devices based on Mott transitions.

*This research was supported by the Office of Basic Energy Science, U.S. Department of Energy, BES-DMS funded by the Department of Energy’s Office of Basic Energy Science, DMR under grant DE FG02 87ER-45332.

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Presenters

  • Pavel Lapa

    • Department of Physics, University of California San Diego

Authors

  • Pavel Lapa

    • Department of Physics, University of California San Diego

  • Minhan Lee

    • Department of Physics, University of California San Diego
    • University of California, San Diego

  • Felipe Torres

    • Departamento de Física, Universidad de Chile

  • I-Ting Chiu

    • Department of Chemical Engineering, University of California Davis

  • Yayoi Takamura

    • University of California, Davis
    • Department of Materials Science and Engineering, University of California Davis

  • Ivan Schuller

    • University of California, San Diego
    • Department of Physics, University of California San Diego
    • Center for Advanced Nanoscience, Department of Physics, University of California-San Diego