Publication Date:
2018-04-06
Description:
Author(s): Wei-Tin Chen, Chin-Wei Wang, Hung-Cheng Wu, Fang-Cheng Chou, Hung-Duen Yang, Arkadiy Simonov, and M. S. Senn 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 HgMn 3 Mn 4 O 12 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. [Phys. Rev. B 97, 144102] Published Thu Apr 05, 2018
Keywords:
Structure, structural phase transitions, mechanical properties, defects
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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