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Transition metal oxides exhibit unique structure-property relationships that help in developing new electronic and photonic devices. Vanadium is a transition metal ([Ar]3d34s2) with multiple oxidation states leading to various stoichiometric and nonstoichiometric oxides. Although most of the vanadium oxides exhibit metal to insulator transitions (MIT) as a function of temperature, VO2 finds tremendous attraction and turns out to be the focus of extensive research because of the ongoing controversy on the origin of its phase transition. Since the MIT is generally accompanied by a structural phase transition (SPT) in VO2, the origin of the metallic behavior, however, is still under debate.
In this talk, after a brief introduction of the various phases of vanadium dioxide, I will discuss about the origin of the phase transition, whether electron-phonon coupling (Peierls type) or strong electron-electron correlation (Mott type) triggers the MIT in VO2. |