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Sliding-mediated ferroelectric phase transition in CuInP2S6 under pressure

Authors :
Zhou, Zhou
Zhang, Jun-Jie
Turner, Gemma F.
Moggach, Stephen A.
Lekina, Yulia
Morris, Samuel
Wang, Shun
Hu, Yiqi
Li, Qiankun
Xue, Jinshuo
Feng, Zhijian
Yan, Qingyu
Weng, Yuyan
Xu, Bin
Fang, Yong
Shen, Ze Xiang
Fang, Liang
Dong, Shuai
You, Lu
Source :
Applied Physics Reviews 11, 011414 (2024)
Publication Year :
2024

Abstract

Interlayer stacking order has recently emerged as a unique degree of freedom to control crystal symmetry and physical properties in two-dimensional van der Waals (vdW) materials and heterostructures. By tuning the layer stacking pattern, symmetry-breaking and electric polarization can be created in otherwise non-polar crystals, whose polarization reversal depends on the interlayer sliding motion. Herein, we demonstrate that in a vdW layered ferroelectric, its existing polarization is closely coupled to the interlayer sliding driven by hydrostatic pressure. Through combined structural, electrical, vibrational characterizations, and theoretical calculations, we clearly map out the structural evolution of CuInP2S6 under pressure. A tendency towards a high polarization state is observed in the low-pressure region, followed by an interlayer-sliding-mediated phase transition from a monoclinic to a trigonal phase. Along the transformation pathway, the displacive-instable Cu ion serves as a pivot point that regulates the interlayer interaction in response to external pressure. The rich phase diagram of CuInP2S6, which is enabled by stacking orders, sheds light on the physics of vdW ferroelectricity and opens an alternative route to tailoring long-range order in vdW layered crystals.<br />Comment: 22 pages, 4 figures

Details

Database :
arXiv
Journal :
Applied Physics Reviews 11, 011414 (2024)
Publication Type :
Report
Accession number :
edsarx.2402.13639
Document Type :
Working Paper
Full Text :
https://doi.org/10.1063/5.0177451