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Direct visualization of percolating metal-insulator transition in V_(2)O_(3) using scanning microwave impedance microscopy

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 112-118页

作者： Weiyan Lin Huanyu Zhang yoav kalcheim Xinchen Zhou Fubao Yang Yang Shi Yang Feng Yihua Wang Jiping Huang Ivan KSchuller Xiaodong Zhou Jian Shen State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China Department of Physics Fudan UniversityShanghai 200433China Department of Physics University of California San DiegoLa Jolla 92093USA Center for Advanced Nanoscience University of California San DiegoLa Jolla 92093USA Key Laboratory of Micro and Nano Photonic Structures(MOE) Fudan UniversityShanghai 200433China Beijing Academy of Quantum Information Science Beijing 100193China Shanghai Research Center for Quantum Sciences Shanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Shanghai Qi Zhi Institute Shanghai 200232China Zhangjiang Fudan International Innovation Center Fudan UniversityShanghai 201203China

Using the extensively studied V_(2)O_(3) as a prototype system, we investigate the role of percolation in metal-insulator transition(MIT). We apply scanning microwave impedance microscopy to directly determine the metallic phase fraction p and relate it to the macroscopic conductance G, which shows a sudden jump when p reaches the percolation threshold. Interestingly, the conductance G exhibits a hysteretic behavior against p, suggesting two different percolating processes upon cooling and warming. Based on our image analysis and model simulation, we ascribe such hysteretic behavior to different domain nucleation and growth processes between cooling and warming, which is likely caused by the decoupled structural and electronic transitions in V_(2)O_(3) during MIT. Our work provides a microscopic view of how the interplay of structural and electronic degrees of freedom affects MIT in strongly correlated systems.

关键词： electronic phase separation metal-insulator transition percolation theory scanning microwave impedance microscopy

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Direct visualization of percolating metal-insulator transition in VOusing scanning microwave impedance microscopy

引用

Science China(Physics,Mechanics & Astronomy) 2022年

作者： Weiyan Lin Huanyu Zhang yoav kalcheim Xinchen Zhou Fubao Yang Yang Shi Yang Feng Yihua Wang Jiping Huang Ivan K.Schuller Xiaodong Zhou Jian Shen Collaborative Innovation Center of Advanced Microstructures State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan University Department of Physics Fudan University Department of Physics University of California San Diego Center for Advanced Nanoscience University of California San Diego Key Laboratory of Micro and Nano Photonic Structures (MOE) Fudan University Beijing Academy of Quantum Information Science Shanghai Research Center for Quantum Sciences 8. Shanghai Qi Zhi Institute Zhangjiang Fudan International Innovation Center Fudan University

Using the extensively studied VOas a prototype system, we investigate the role of percolation in metal-insulator transition（MIT）. We apply scanning microwave impedance microscopy to directly determine the metallic phase fraction p and relate it to the macroscopic conductance G, which shows a sudden jump when p reaches the percolation threshold. Interestingly, the conductance G exhibits a hysteretic behavior against p, suggesting two different percolating processes upon cooling and warming. Based on our image analysis and model simulation, we ascribe such hysteretic behavior to different domain nucleation and growth processes between cooling and warming, which is likely caused by the decoupled structural and electronic transitions in VOduring MIT. Our work provides a microscopic view of how the interplay of structural and electronic degrees of freedom affects MIT in strongly correlated systems.

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