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Direct observation of ferroelectricity in Ca$_3$Mn$_2$O$_7$ and its prominent light absorption

Direct observation of ferroelectricity in Ca$_3$Mn$_2$O$_7$ and its prominent light absorption

Authors :
Liu, Meifeng
Zhang, Yang
Lin, Ling-Fang
Lin, Lin
Yang, Shengwei
Li, Xiang
Wang, Yu
Li, Shaozhen
Yan, Zhibo
Wang, Xiuzhang
Li, Xiao-Guang
Dong, Shuai
Liu, Jun-Ming
Source :
Applied Physics Letters 113, 022902 (2018)
Publication Year :
2018

Abstract

Layered perovskites $A_3M_2$O$_7$ are known to exhibit the so-called hybrid improper ferroelectricity. Despite experimentally confirmed cases (e.g. nonmagnetic $M$=Ti and Sn), the ferroelectricity in magnetic Ca$_3$Mn$_2$O$_7$ remains a puzzle. Here, the structural, ferroelectric, magnetoelectric, and optical properties of Ca$_3$Mn$_2$O$_7$ are systematically investigated. Switchable polarization is directly measured, demonstrating its ferroelectricity. In addition, magnetoelectric response is also evidenced, implying the coupling between magnetism and ferroelectricity. Furthermore, strong visible light absorption is observed, which can be understood from its electronic structure. Its direct and appropriate band gap, as well as wide conducting bands, makes Ca$_3$Mn$_2$O$_7$ a potential candidate for ferroelectric photoelectric applications.<br />Comment: 5 pages, 4 figures

Details

Database :
arXiv
Journal :
Applied Physics Letters 113, 022902 (2018)
Publication Type :
Report
Accession number :
edsarx.1809.10056
Document Type :
Working Paper
Full Text :
https://doi.org/10.1063/1.5037525