Even-odd layer-dependent multiferroic in freestanding rare-earth orthorhombic perovskite  

作　　者：Shaowen Xu Fanhao Jia Ning Dai 

机构地区：[1]School of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China [2]Department of Physics,College of Science,Hangzhou Dianzi University,Hangzhou 310018,China [3]State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第7期151-157,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.12347115);Hangzhou Science and Technology Bureau of Zhejiang Province(Grant No.TD2020002);the support of China Postdoctoral Science Foundation(Grant No.2022M722035)。

摘　　要：Freestanding oxide perovskites possess strong interlayer coupling between adjacent atomic layers,thus exerting a determinative effect on the magnetism and ferroelectricity of these atomic-scale materials.Here,we propose an effective strategy to manipulate magnetism and ferroelectricity in freestanding rare-earth orthorhombic perovskite via modulation of layer thickness.By performing first-principles calculations,an even-odd oscillation is demonstrated in few-layer GdAlO_(3)perovskite(GAP).Specifically,odd-layer systems with charged atomic layers are ferromagnetic polar metals,while even-layer systems are antiferromagnetic ferroelectric semiconductors.This thickness-dependent magnetic phase transition originates from carrier doping,as rationalized by the Stoner criterion.Furthermore,we demonstrate the promotion of in-plane ferroelectricity via the concurrent application of two distinct antiferrodistortive displacements,each driven by formation and breaking of bonds.Analogous multiferroic phases may emerge in other transition metal oxide perovskites supporting multiple valence states,e.g.,few-layer Gd MO_(3)(M=V,Cr,Mn,and Ni).This work puts forward a strategy for layer thickness engineering of magnetism and ferroelectricity in 2D oxide perovskite multiferroic materials.

关 键 词：few-layer rare-earth perovskite multiferroicity size effect first principles calculations 

分 类 号：O469[理学—凝聚态物理]