Quasi one-dimensional van der Waals gold selenide with strong interchain interaction and giant magnetoresistance  

具有强链间相互作用和巨磁阻的准一维范德华材料AuSe

作　　者：Jingli Wang Jingsi Qiao Kang Xu Jiewei Chen Yuda Zhao Bocheng Qiu Ziyuan Lin Wei Ji Yang Chai 王竞立;乔婧思;徐康;陈杰威;赵昱达;邱博诚;林梓愿;季威;柴扬(Department of Applied Physics,The Hong Kong Polytechnic University,Hong Kong,China;The Hong Kong Polytechnic University Shenzhen Research Institute,Shenzhen 518054,China;Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano Devices,Renmin University of China,Beijing 100872,China)

机构地区：[1]Department of Applied Physics,The Hong Kong Polytechnic University,Hong Kong,China [2]The Hong Kong Polytechnic University Shenzhen Research Institute,Shenzhen 518054,China [3]Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano Devices,Renmin University of China,Beijing 100872,China

出　　处：《Science Bulletin》2020年第17期1451-1459,M0003,共10页科学通报（英文版）

基　　金：This work was supported by the Research Grant Council of Hong Kong(N_PolyU540/17);the Shenzhen Science and Technology Innovation Commission(JCYJ20180507183424383);the Hong Kong Polytechnic University(G-SB79 and G-YBPS).

摘　　要：The atomic structure of quasi one-dimensional(1D) van der Waals materials can be regarded as the stacking of atomic chains to form thin flakes or nanoribbons, which substantially differentiates them from typical two-dimensional(2D) layered materials and 1D nanotube/nanowire array. Here we present our studies on quasi 1D gold selenide(AuSe) that possesses highly anisotropic crystal structure, excellent electrical conductivity, giant magnetoresistance, and unusual reentrant metallic behavior. The low inplane symmetry of AuSe gives rise to its high anisotropy of vibrational behavior. In contrast, quasi 1D AuSe exhibits high in-plane electrical conductivity along the directions of both atomic chains and perpendicular one, which can be understood as a result of strong interchain interaction. We found that AuSe exhibits a near quadratic nonsaturating giant magnetoresistance of 1841% with the magnetic field perpendicular to its in-plane. We also observe unusual reentrant metallic behavior, which is caused by the carrier mismatch in the multiband transport. Our works help to establish fundamental understandings on quasi 1D van der Waals semimetallic AuSe and identify it as a new candidate for exploring giant magnetoresistance and compensated semimetals.准一维范德华材料的原子结构可以看作是原子链的堆叠形成的纳米带,这使它们与典型的二维层状材料和一维纳米管/纳米线有明显的区别.本文研究了一种新型的准一维半金属硒化金(AuSe).研究发现, AuSe具有高度各向异性的晶体结构和出色的导电性,在磁场下表现出高达1841%的巨磁阻以及reentrant-metallic的现象.其沿着原子链和垂直原子链的方向都具有较高的面内电导率,可以理解为强的链间相互作用.本文发现硒化金满足电子空穴补偿机制,使其具有抛物线形的巨磁阻效应,而低温下出现的reentrantmetallic的现象,则是由于电子空穴失配引起.

关 键 词：Quasi one-dimensional(1D)materials Two-dimensional(2D)materials van der Waals ANISOTROPIC Giant magnetoresistance 

分 类 号：O614.123[理学—无机化学]