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Qazilbash, M.M; Brehm, M; Chae, Byung-Gyu; Ho, P.-C; Andreev, G.O; Kim, Bong-Jun; Yun, Sun Jin; Balatsky, A.V; Maple, M.B; Keilmann, F; Kim, Hyun-Tak; Basov, D.N
Science (American Association for the Advancement of Science), 12/2007, Letnik: 318, Številka: 5857Journal Article
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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