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.

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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