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Improper ferroelectric polarization in a perovskite driven by intersite charge transfer and ordering

    Home Publications Improper ferroelectric polarization in a perovskite driven by intersite charge transfer and ordering
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    Improper ferroelectric polarization in a perovskite driven by intersite charge transfer and ordering

    By Mark | Publications | Comments are Closed | 5 April, 2018 | 0

    Wei-Tin Chen, Chin-Wei Wang, Hung-Cheng Wu, Fang-Cheng Chou, Hung-Duen Yang, Arkadiy Simonov, and Mark S. Senn, Phys. Rev. B 97, 144102 (2018)

     

    There has recently been renewed interest in improper ferroelectricity due to the discovery of a “hybrid” mechanism by which two nonpolar lattice modes couple to a third polar mode. Here, the authors demonstrate that the polar ground state of perovskite HgMn3Mn4O12 emerges due to electronic instabilities that drive charge and orbital ordering on the A- and B-sites. These order parameters couple to polar displacements (P) in a manner conceptually similar to hybrid improper ferroelectricity. The results open up a possible route for electronic control of orbital ordering – an appealing prospect given the technologically important properties dependent on such states

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