title: Pressure-induced superconductivity in beta- Na (0.33) V(2)O(5) beyond charge ordering.
abstract: We report the discovery of a new superconducting phase in highly correlated 3d electron systems. The compound is beta-vanadium bronze, beta- Na0.33V 2O5, in which the charge-ordered phase collapses under hydrostatic high pressure and a pressure-induced superconducting phase appears around T(S C)=8 K, P=8 GPa. This report presents the first observation not only of superconductivity in vanadium oxides but also of a phase transition from charge ordered to superconducting on a pressure-temperature (P- T) plane. The phase diagrams seem to have universal aspects across the classes of materials. This indicates a profound physics of superconductivity in highly correlated electron systems.
authors.affiliation: Material Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamauchi
authors.forename: Y
authors.initials: Y
authors.lastname: Ueda
authors.forename: N
authors.initials: N
authors.lastname: Môri