磁有序CoH2SeO4薄片中的室温铁电性

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中文摘要：本文通过第一性原理计算和实验表征证明了二维CoH2SeO4薄膜的磁有序和滑移铁电性.首先,实验结果证实了粉末CoH2SeO4样品的反铁磁序.同时,第一性原理计算表明单层CoH2SeO4具有反铁磁(AFM-I)基态(TN≈75 K),且预测了二维CoH2SeO4薄膜具有以不对称的三重势阱态为特征的滑移铁电性,并在实验中测得了 180°压电滞回线、可反转铁电畴和二次谐波信号.此外,在基于二维CoH2SeO4薄膜的电容器中获得铁电材料所特有的电滞回线和蝴蝶状的电容曲线.介电温谱测试表明二维CoH2SeO4薄膜的铁电转变温度约为370 K.CoH2SeO4中滑移铁电性和反铁磁性的出现为获得低维多铁材料指出了一条新的途径.

外文标题：Room-temperature ferroelectricity in magnetically ordered CoH2SeO4 flakes

外文摘要：Here,we demonstrate the existence of magnetic ordering and sliding ferroelectricity in two-dimensional CoH2SeO4 multilayers.The experimental result reveals the antiferromagnetic order in powder sample,and first-princi-ples calculation indicates the antiferromagnetic ground state with TN≈75 K in CoH2SeO4 single layer.The sliding ferroe-lectricity with an asymmetric triplet potential well is theore-tically predicted and experimentally confirmed by 180°-piezoelectric hysteresis loops,switchable domains and second harmonic generation signals in CoH2SeO4 multilayers.The vertically stacked ferroelectric capacitor shows both polariza-tion and capacitance hysteresis loops.A ferroelectric transi-tion temperature of-370 K is obtained from the temperature-dependent dielectricity.The emergence of sliding ferroelec-tricity and anti-ferromagnetism points out a new route for obtaining low-dimensional multiferroic materials.

外文关键词：

two-dimensional materialssliding ferroelectricitymultiferroic materials

作者：

陈璐秋、余冰、沈阳、刘逸飞、王号南、冯光迪、朱秋香、罗卫东、刘俊明、万建国、赵庆彪、田博博、褚君浩、段纯刚

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作者单位：

Key Laboratory of Polar Materials and Devices(MOE),Shanghai Center of Brain-inspired Intelligent Materials and Devices,and Department of Electronics,East China Normal University,Shanghai 200241,China

Zhejiang Lab,Hangzhou 310000,China

Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

Key Laboratory of Artificial Structures and Quantum Control,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China

School of Chemistry and Environmental Engineering,Wuhan Institute of Technology,Wuhan 430205,China

State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China

Institute of Optoelectronics,Fudan University,Shanghai 200433,China

Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

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关键词：

two-dimensional materials sliding ferroelectricity multiferroic materials

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShanghai Science and Technology Innovation Action PlanShanghai Science and Technology Innovation Action PlanFundamental Research Funds for the Central Universities

项目编号：

2021YFA120070052372120T22220256217405321JC140200021520714100

出版年：

2024

DOI：

10.1007/s40843-023-2795-0

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(5)

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