Anomalous polarization enhancement in a van der Waals ferroelectric material under pressure

Xiaodong Yao, Yinxin Bai, Cheng Jin, Xinyu Zhang, Qunfei Zheng, Zedong Xu, Lang Chen, Shanmin Wang, Ying Liu, Junling Wang () and Jinlong Zhu ()
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Xiaodong Yao: Southern University of Science and Technology
Yinxin Bai: Southern University of Science and Technology
Cheng Jin: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Xinyu Zhang: Southern University of Science and Technology
Qunfei Zheng: Southern University of Science and Technology
Zedong Xu: Southern University of Science and Technology
Lang Chen: Southern University of Science and Technology
Shanmin Wang: Southern University of Science and Technology
Ying Liu: Southern University of Science and Technology
Junling Wang: Southern University of Science and Technology
Jinlong Zhu: Southern University of Science and Technology

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: Abstract CuInP2S6 with robust room-temperature ferroelectricity has recently attracted much attention due to the spatial instability of its Cu cations and the van der Waals (vdW) layered structure. Herein, we report a significant enhancement of its remanent polarization by more than 50% from 4.06 to 6.36 µC cm−2 under a small pressure between 0.26 to 1.40 GPa. Comprehensive analysis suggests that even though the hydrostatic pressure suppresses the crystal distortion, it initially forces Cu cations to largely occupy the interlayer sites, causing the spontaneous polarization to increase. Under intermediate pressure, the condensation of Cu cations to the ground state and the polarization increase due cell volume reduction compensate each other, resulting in a constant polarization. Under high pressure, the migration of Cu cations to the center of the S octahedron dominates the polarization decrease. These findings improve our understanding of this fascinating vdW ferroelectric material, and suggest new ways to improve its properties.

Date: 2023
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DOI: 10.1038/s41467-023-40075-6

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