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  • Strain‐Driven Stabilization of a Room‐Temperature Chiral Multiferroic with Coupled Ferroaxial and Ferroelectric Order
Title: Strain‐Driven Stabilization of a Room‐Temperature Chiral Multiferroic with Coupled Ferroaxial and Ferroelectric Order
Abstract Noncollinear ferroic materials are sought after as testbeds to explore the intimate connections between topology and symmetry, which result in electronic, optical, and magnetic functionalities not observed in collinear ferroic materials. For example, ferroaxial materials have rotational structural distortions that break mirror symmetry and induce chirality. When ferroaxial order is coupled with ferroelectricity arising from a broken inversion symmetry, it offers the prospect of electric‐field‐control of the ferroaxial distortions and opens up new tunable functionalities. However, chiral multiferroics, especially ones stable at room temperature, are rare. A strain‐stabilized, room‐temperature chiral multiferroic phase in single crystals of BaTiS3is reported here. Using first‐principles calculations, the stabilization of this multiferroic phase havingP63space group for biaxial tensile strains exceeding 1.5% applied on the basalab‐plane of the room temperatureP63cmphase of BaTiS3is predicted. The chiral multiferroic phase is characterized by rotational distortions of TiS6octahedra around the longc‐axis and polar displacement of Ti atoms along thec‐axis. The ferroaxial and ferroelectric distortions and their domains inP63‐BaTiS3are directly resolved using atomic resolution scanning transmission electron microscopy. Landau‐based phenomenological modeling predicts a strong coupling between the ferroelectric and the ferroaxial order makingP63‐BaTiS3an attractive test bed for achieving electric‐field‐control of chirality.  more » « less
Award ID(s):
2122071 2145797 2122070
PAR ID:
10582401
Author(s) / Creator(s):
; ; ; ; ; ; ; ; ; ; ;
Publisher / Repository:
arXiv
Date Published:
Journal Name:
Advanced Functional Materials
Volume:
35
Issue:
10
ISSN:
1616-301X
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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