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

Yao，Xiaodong1; Bai，Yinxin1; Jin，Cheng2; Zhang，Xinyu1; Zheng，Qunfei1; Xu，Zedong1; Chen，Lang1; Wang，Shanmin1; Liu，Ying1; Wang，Junling1,3; Zhu，Jinlong1

2023-12-01

10.1038/s41467-023-40075-6

Nature Communications   Impact Factor & Quartile

2041-1723

CuInPS 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 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.

SCI

English

NI Journal Papers ; NI论文

First ; Corresponding

National Natural Science Foundation of China-Yunnan Joint Fund[11904281];National Natural Science Foundation of China-Yunnan Joint Fund[12004161];National Natural Science Foundation of China-Yunnan Joint Fund[12274193];National Natural Science Foundation of China-Yunnan Joint Fund[2074164];

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001037322100035

NATURE PORTFOLIO

2-s2.0-85165263822

Scopus

1.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
2.Center for High Pressure Science and Technology Advanced Research (HPSTAR),Beijing,100094,China
3.Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen,China

Yao，Xiaodong,Bai，Yinxin,Jin，Cheng,et al. Anomalous polarization enhancement in a van der Waals ferroelectric material under pressure[J]. Nature Communications,2023,14(1).

Yao，Xiaodong.,Bai，Yinxin.,Jin，Cheng.,Zhang，Xinyu.,Zheng，Qunfei.,...&Zhu，Jinlong.(2023).Anomalous polarization enhancement in a van der Waals ferroelectric material under pressure.Nature Communications,14(1).

Yao，Xiaodong,et al."Anomalous polarization enhancement in a van der Waals ferroelectric material under pressure".Nature Communications 14.1(2023).