Dimensional crossover tuned by pressure in layered magnetic NiPS_(3)

查看全文 作　　者：Xiaoli [1]Ma;Yimeng [2]Wang;Yunyu [1]Yin;Binbin [3]Yue;Jianhong [1]Dai;Jinguang [1,4]Cheng;Jianting [1]Ji;Feng [1]Jin;Fang [1,4,5]Hong;Jian-Tao [1,4,5]Wang;Qingming [6,1]Zhang;Xiaohui [1,4,5]Yu 机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;[2]Department of Physics,Renmin University of China,Beijing 100872,China;[3]Center for High Pressure Science and Technology Advanced Research,Beijing 100094,China;[4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;[5]Songshan Lake Materials Laboratory,Dongguan 523808,China;[6]School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2021年第64卷第9期,共8页 基　　金：the National Key Research and Development Program of China(Grant Nos.2016YFA0401503,2018YFA0305700,2017YFA0302904,2020YFA0711502,and 2016YFA0300500);the National Natural Science Foundation of China(Grant Nos.11575288,11974387,U1932215,U1930401,12004014,22090041,and 11774419);the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(Grant Nos.XDB33000000,XDB25000000,and QYZDBSSW-SLH013);the Youth Innovation Promotion Association of Chinese Academy of Sciences(Grant No.Y202003);the CAS Interdisciplinary Innovation Team(Grant No.JCTD-2019-01);ADXRD measurements were performed at 4W2 High Pressure Station,Beijing Synchrotron Radiation Facility(BSRF),which is supported by the Chinese Academy of Sciences(Grant Nos.KJCX2-SW-N20,and KJCX2-SW-N03)。 摘　　要：The physical properties of most 2D materials are highly dependent on the nature of their interlayer interaction.In-depth studies of the interlayer interaction are beneficial to the understanding of the physical properties of 2D materials and permit the development of related devices.Layered magnetic NiPS_(3)has unique magnetic and electronic properties.The electronic band structure and corresponding magnetic state of NiPS_(3)are expected to be sensitive to the interlayer interaction,which can be tuned by external pressure.Here,we report an insulator-metal transition accompanied by the collapse of magnetic order during the 2D-3D structural crossover induced by hydrostatic pressure.A two-stage phase transition from a monoclinic(C2/m)to a trigonal(P31m)lattice is identified via ab initio simulations and confirmed via high-pressure X-ray diffraction and Raman scattering;this transition corresponds to a layer-by-layer slip mechanism along the a-axis.Temperature-dependent resistance measurements and room temperature infrared spectroscopy under different pressures demonstrate that the insulator-metal transition and the collapse of the magnetic order occur at~20 GPa,which is confirmed by low-temperature Raman scattering measurements and theoretical calculations.These results establish a strong correlation between the structural change,electric transport,and magnetic phase transition and expand our understanding of layered magnetic materials.Moreover,the structural transition caused by the interlayer displacement has significance for designing similar devices at ambient pressure. 关 键 词：metal-insulator transition magnetic phase transition structural phase transition