Abstract
Detailed temperature-dependent transport, optical microscopy, and synchrotron-based polychromatic x-ray microdiffraction measurements have been carried out in the vicinity of the metal-insulator transition (MIT) temperature of VO${}_{2}$ single crystals. The formation and propagation of a real-space phase boundary along the rutile c axis is monitored during the transition. Pure metallic rutile R, as well as insulating monoclinic M1 phases, is observed at the onset of MIT. The two phases are separated by a sharp-phase boundary. Our findings suggest a nonpercolative nature of the MIT in VO${}_{2.}$
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