Metal-Insulator Phase Transition in Quasi-One-Dimensional VO₂ Structures

Figure 7

(a) Optical images of an ordered array of triangular metallic (dark regions) and insulating (bright regions) domains nucleated and stabilized by tensile and compressive strains during a heating cycle. (b) A phase diagram as a function of temperature and uniaxial stress or strain. (c) The metallic phase fraction (η) as a function of the total strain. The inset shows representative optical images of metal-insulator domains along a compressive stressed beam. (d) Current-voltage characteristics of a VO₂ beam under different axial compressions at room temperature. The scale bars in (a) and (c) are 10 μm. Panels (a–d) adapted with permission from [36].

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