Van-der-Waals layered ferroelectric CuInP<sub>2</sub>S<sub>6</sub> II: negative electrostriction and pressure-induced switching

ORAL

Abstract

Layered ferroelectric CuInP2S6 (CIPS) is highly unusual in light of its negative longitudinal piezoelectric coefficient the recently predicted quadruple-well potential (previous abstract, Brehm et al.). Here we show an even larger spectrum of peculiar behaviors, obtained via systematic analysis of nanoscale electromechanical properties with scanning probe microscopy [1]: giant negative electrostriction, coexistence of high and low polarization phases with four distinct polarization orientations, and intrinsic pressure-induced polarization switching. These properties derive from the quadruple potential well for polar displacements, verifying its existence. The combination of unique properties enable deeper insight from microscopic measurements, such as imaging of inhomogeneous strain distribution. More broadly, the peculiarities of CIPS are in large part engendered by its van der Waals structure, thus opening new prospects at the intersection of ferroelectric and 2D materials. [1] J. A. Brehm et al. “Tunable quadruple-well ferroelectric van-der-Waals crystals” Nature Mater., in press.

*Funding: Work at CNMS, ORNL supported by DOE BES MSE. At Vanderbilt MSE Div. DE-FG02-09ER46554; LT partially funded by IoP, CAS, Beijing.

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Presenters

  • Petro Maksymovych

    • Center for Nanophase Materials Sciences, Oak Ridge National Lab
    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

Authors

  • John A Brehm

    • Vanderbilt University

  • Sabine M. Neumayer

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Lei Tao

    • Vanderbilt University
    • Chinese Academy of Sciences

  • Andrew O'Hara

    • Department of Physics and Astronomy, Vanderbilt Univ
    • Department of Physics and Astronomy, Vanderbilt University
    • Vanderbilt University

  • Marius Chyasnavichus

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Michael Susner

    • UES, Inc.
    • Aerospace Systems Directorate, Air Force Research Laboratory
    • Oak Ridge National Lab
    • Air Force Research Laboratory

  • Michael McGuire

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Materials Science Division, Oak Ridge National Laboratory

  • Sergei V. Kalinin

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Stephen Jesse

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • University of Tennessee

  • Panchapakesan Ganesh

    • Center for Nanophase Materials and Sciences, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Sokrates T Pantelides

    • Department of Physics and Astronomy, Vanderbilt Univ
    • Department of Physics and Astronomy, Vanderbilt University
    • Vanderbilt University

  • Petro Maksymovych

    • Center for Nanophase Materials Sciences, Oak Ridge National Lab
    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Nina Balke

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory