Anisotropic metal–insulator transition in strained VO_(2)(B) single crystal  

作　　者：马泽成 闫胜楠 刘增霖 徐涛 陈繁强 陈思成 曹天俊 孙立涛 程斌 梁世军 缪峰 Zecheng Ma;Shengnan Yan;Zenglin Liu;Tao Xu;Fanqiang Chen;Sicheng Chen;Tianjun Cao;Litao Sun;Bin Cheng;Shi-Jun Liang;Feng Miao(Institute of Brain-Inspired Intelligence,National Laboratory of Solid State Microstructures,School of Physics,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;SEU-FEI Nano-Pico Center,Key Laboratory of MEMS of Ministry of Education,Southeast University,Nanjing 210096,China;Institute of Interdisciplinary of Physical Sciences,School of Science,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]Institute of Brain-Inspired Intelligence,National Laboratory of Solid State Microstructures,School of Physics,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [2]SEU-FEI Nano-Pico Center,Key Laboratory of MEMS of Ministry of Education,Southeast University,Nanjing 210096,China [3]Institute of Interdisciplinary of Physical Sciences,School of Science,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Chinese Physics B》2024年第6期56-61,共6页中国物理B（英文版）

基　　金：Project supported by the National Key R&D Program of China (Grant No. 2023YFF1203600);the National Natural Science Foundation of China (Grant Nos. 62122036, 62034004, 12322407, 61921005, and 12074176);the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB44000000);supported by the program for Outstanding Ph D Candidates of Nanjing University。

摘　　要：Mechanical strain can induce noteworthy structural and electronic changes in vanadium dioxide, imparting substantial scientific importance to both the exploration of phase transitions and the development of potential technological applications. Unlike the traditional rutile(R) phase, bronze-phase vanadium dioxide [VO_(2)(B)] exhibits an in-plane anisotropic structure. When subjected to stretching along distinct crystallographic axes, VO_(2)(B) may further manifest the axial dependence in lattice–electron interactions, which is beneficial for gaining insights into the anisotropy of electronic transport.Here, we report an anisotropic room-temperature metal–insulator transition in single-crystal VO_(2)(B) by applying in-situ uniaxial tensile strain. This material exhibits significantly different electromechanical responses along two anisotropic axes.We reveal that such an anisotropic electromechanical response mainly arises from the preferential arrangement of a straininduced unidirectional stripe state in the conductive channel. This insulating stripe state could be attributed to the in-plane dimerization within the distorted zigzag chains of vanadium atoms, evidenced by strain-modulated Raman spectra. Our work may open up a promising avenue for exploiting the anisotropy of metal–insulator transition in vanadium dioxide for potential technological applications.

关 键 词：vanadium dioxide STRAIN ANISOTROPY electrical transport 

分 类 号：O469[理学—凝聚态物理]