首页|Anisotropic metal-insulator transition in strained VO2(B)single crystal
Anisotropic metal-insulator transition in strained VO2(B)single crystal
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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 applica-tions.Unlike the traditional rutile(R)phase,bronze-phase vanadium dioxide[VO2(B)]exhibits an in-plane anisotropic structure.When subjected to stretching along distinct crystallographic axes,VO2(B)may further manifest the axial depen-dence 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 VO2(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 strain-induced 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.
vanadium dioxidestrainanisotropyelectrical transport
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
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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
国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金中国科学院战略规划重点项目AIQ Foundationmicrofabrication center of the National Laboratory of Solid State Microstructures(NLSSM)program for Outstanding PhD Candidates of Nanjing University
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