Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-11-02
Nature Communications 1:105 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Paper plus supplementary material
Scientific paper
10.1038/ncomms1109
V2O3 is the prototype system for the Mott transition, one of the most fundamental phenomena of electronic correlation. Temperature, doping or pressure induce a metal to insulator transition (MIT) between a paramagnetic metal (PM) and a paramagnetic insulator (PI). This or related MITs have a high technological potential, among others for intelligent windows and field effect transistors. However the spatial scale on which such transitions develop is not known in spite of their importance for research and applications. Here we unveil for the first time the MIT in Cr-doped V2O3 with submicron lateral resolution: with decreasing temperature, microscopic domains become metallic and coexist with an insulating background. This explains why the associated PM phase is actually a poor metal. The phase separation can be associated with a thermodynamic instability near the transition. This instability is reduced by pressure which drives a genuine Mott transition to an eventually homogeneous metallic state.
Andersen Ole Krogh
Baldassarre Luca
Barinov A.
Dudin P.
Hansmann P.
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