Nature of the Phase Transitions Leading to Hybrid Improper Ferroelectricity in Ca3X2O7

ORAL

Abstract

Detailed structural and optical measurements reveal that the tilt and rotation distortion relative to the high symmetry phase driving ferroelectricity in the system Ca3X2O7 system (X=Mn and Ti) condense at different temperatures. The condensation of the rotation and tilt distortions at distinctly different temperatures is unexpected. Experimental results, combined with DFT simulation of the atomic force constants, suggest that this loss of a polar state is driven by the relative strength of the A-O bonds to the X-O bonds. Raman measurements under isotropic pressure are used to assess the stability of the tilt and rotational distortions.

*This work is supported by NSF Grant No. DMR-1809931.

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Presenters

  • Trevor Tyson

    • New Jersey Inst of Tech
    • New Jersey Institute of Technology

Authors

  • Sizhan Liu

    • New Jersey Inst of Tech
    • New Jersey Institute of Technology

  • Han Zhang

    • New Jersey Inst of Tech
    • New Jersey Institute of Technology
    • Physics, University of Tennessee

  • Sanjit Ghose

    • Brookhaven National Laboratory

  • Mali Balasubramanian

    • Argonne National Laboratory

  • Zhenxian Liu

    • Brookhaven National Laboratory
    • C&EE Department, George Washington University
    • George Washington University
    • Brookhaven National Lab

  • SuYin Grass Wang

    • Argonne National Laboratory

  • Yu-Sheng Chen

    • Argonne National Laboratory

  • Bin Gao

    • Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Rutgers University
    • Rutgers University
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University

  • Jaewook Kim

    • Rutgers University

  • Sang-Wook Cheong

    • Rutgers University
    • Department of Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Rutgers University
    • Center for Quantum Materials Synthesis and Department of Physics and Astronomy, Rutgers, the State University of New Jersey
    • Department of Physics, Rutgers University
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ
    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
    • Physics, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University, New Jersey
    • Rutgers University, Physics and Astronomy, and Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science
    • RCEM, Department of Physics and Astronomy, Rutgers U.
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials

  • Elizabeth Nowadnick

    • New Jersey Institute of Technology

  • Trevor Tyson

    • New Jersey Inst of Tech
    • New Jersey Institute of Technology