title: Observation of an unconventional metal-insulator transition in overdoped CuO2 compounds.
abstract: The electron dynamics in the normal state of Bi(2)Sr(2)CaCu(2)O(8+delta) is studied by inelastic light scattering over a wide range of doping. A strong anisotropy of the electron relaxation is found which cannot be explained by single-particle properties alone. The results strongly indicate the presence of an unconventional quantum-critical metal-insulator transition where "hot" (antinodal) quasiparticles become insulating while "cold" (nodal) quasiparticles remain metallic. A phenomenology is developed which allows a quantitative understanding of the Raman results and provides a scenario which links single- and many-particle properties.
authors.affiliation: Walther Meissner Institute, Bavarian Academy of Sciences, 85748 Garching, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Venturini
authors.forename: M
authors.initials: M
authors.lastname: Opel
authors.forename: T P
authors.initials: TP
authors.lastname: Devereaux
authors.forename: J K
authors.initials: JK
authors.lastname: Freericks
authors.forename: I
authors.initials: I
authors.lastname: Tütto
authors.forename: B
authors.initials: B
authors.lastname: Revaz
authors.forename: E
authors.initials: E
authors.lastname: Walker
authors.forename: H
authors.initials: H
authors.lastname: Berger
authors.forename: L
authors.initials: L
authors.lastname: Forró
authors.forename: R
authors.initials: R
authors.lastname: Hackl