铁电性
反铁电性
范德瓦尔斯力
材料科学
多铁性
凝聚态物理
偶极子
极化(电化学)
亚稳态
极化
电介质
光电子学
物理
分子
化学
量子力学
物理化学
作者
Kwanghee Cho,Seung‐Yeol Lee,R. Kalaivanan,Raman Sankar,Kwang‐Yong Choi,Soonyong Park
标识
DOI:10.1002/adfm.202204214
摘要
Abstract Recent success in experimental and theoretical works on metal thiophosphates (MTPs) paved the way to add multiple functionalities of complex oxides, such as ferroelectricity, in 2D materials. To realize multiferroicity and magnetoelectric coupling on layered van der Waals materials, incorporating magnetic ions in the ferroelectric framework is desirable. Unfortunately, replacing the metal ion with a magnetic one in MTPs results in antiferroelectricity in which spontaneous macroscopic polarization is absent. Herein, the emergence of a tunable local ferroelectric state in antiferroelectric CuCrP 2 S 6 possessing magnetic Cr 3+ ion is reported. The spontaneous macroscopic polarization is observed, which is switchable by an external poling field through controlling a defect‐dipole polarization in the quasi‐antipolar state. The observations suggest that the formation of defect dipoles, which is facilitated by an order‐disorder‐type structural transition, is likely related to a metastable Cu site within the van der Waals gap and therefore is a smoking gun of the existence of a uniaxial quadruple potential well. The interaction between the defect‐dipole polarization and dipoles in the antipolar matrix may lead to the emerging local ferroelectricity in antiferroelectric CuCrP 2 S 6 . The findings suggest a possibility of utilizing the local ferroelectricity of multiferroic MTPs for novel 2D applications.
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