摘要
层间离子插层的层状材料表现出多样有趣的物理和化学特性.为了获得奇特的二维材料,离子客体对晶体的掺杂和调控在材料科学中得到广泛应用.然而,在离子插层层状材料的研究中,由层间结构变化所引起的性质研究较少.因此,在本文中我们展示了由于Cu_(0.65)NbS_(2)纳米片的新型层间结构导致的超导性.随着维度的降低,层间铜离子的占位从体相结构时的单一四面体位点转变为混合四面体位点,导致原本的普通金属态转变成超导体.值得注意的是,材料的超导转变温度具有强烈的厚度依赖性,并且随厚度变化呈火山曲线,展现出了与纯NbS2体系不同的随样品层数变化关系.操控层间离子的排列方式将成为促进二维材料领域新本征性质研究的重要方法之一.
Layered materials with intercalated ions exhibit a variety of intriguing physical and chemical properties.To obtain the exotic two-dimensional(2D)materials,doping and alteration of crystals by ionic guest species are widely used in materials science.However,in ion-intercalated layered materials,the properties induced by the change of interlayered structures are rarely studied.Hence,we demonstrate the emergence of superconductivity by a new interlayered structure in Cu_(0.65)NbS_(2) nanosheets.The interlayered Cu occupancy changes from ordered tetrahedral sites in bulk to mixed tetrahedral sites as the thickness reduces,which turns the normal-metal crystal into a superconductor.Prominently,the superconducting transition temperature shows a strong thickness dependence with a dome-like shape,which is different with the NbS2 system.The arrangement of the interlayered ions can be a new method for promoting the investigation of novel intrinsic phenomenon in the 2D realm.
作者
刘雨桦
彭晶
张凯
孙梅
黄明
王文杰
苏越麒
武晓君
谢毅
吴长征
Yuhua Liu;Jing Peng;Kai Zhang;Mei Sun;Ming Huang;Wenjie Wang;Yueqi Su;Xiaojun Wu;Yi Xie;Changzheng Wu(School of Chemistry and Materials Science,CAS Center for Excellence in Nanoscience,Instrument Center for Physical Science,School of Nuclear Science and Technology,iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)and CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei 230026,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230031,China;CAS Key Lab of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China)
基金
financially supported by the National Key R&D Program on Nano Science & Technology of the MOST (2017YFA0207301)
the National Natural Science Foundation of China (21925110,21890751,91745113,12147105,22275205,and 22005284)
the National Program for Support of Top-notch Young Professionals,the Fundamental Research Funds for the Central Universities (WK2060190084)
the Youth Innovation Promotion Association CAS (2018500),the National Postdoctoral Program for Innovative Talents (BX20190307,BX20190308)
the Major Program of Development Foundation of Hefei Centre for Physical Science and Technology (2016FXZY001)
the Users with Excellence Project of Hefei Science Centre CAS (2018HSC-UE002)
the CAS Project for Young Scientists in Basic Research (YSBR-070)
the support from the beamline 1W1B of Beijing Synchrotron Radiation Facility (BSRF,Beijing,China)
beamline BL12B-a of the National Synchrotron Radiation Laboratory (NSRL,Hefei,China)
the Cryo-EM Centre at the University of Science and Technology of China for the EM facility support
partially carried out at the USTC Centre for Micro and Nanoscale Research and Fabrication
the support from the Super Computer Centre of USTCSCC and SCCAS
