Journal
SCIENCE
Volume 318, Issue 5857, Pages 1748-1750Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1149066
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Electrons in correlated insulators are prevented from conducting by Coulomb repulsion between them. When an insulator- to- metal transition is induced in a correlated insulator by doping or heating, the resulting conducting state can be radically different from that characterized by free electrons in conventional metals. We report on the electronic properties of a prototypical correlated insulator vanadium dioxide in which the metallic state can be induced by increasing temperature. Scanning near- field infrared microscopy allows us to directly image nanoscale metallic puddles that appear at the onset of the insulator- to- metal transition. In combination with far- field infrared spectroscopy, the data reveal the Mott transition with divergent quasi- particle mass in the metallic puddles. The experimental approach used sets the stage for investigations of charge dynamics on the nanoscale in other inhomogeneous correlated electron systems.
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