title: Doping controlled superconductor-insulator transition in Bi2Sr2-xLaxCaCu2O8+delta.
abstract: We show that the doping-controlled superconductor-insulator transition (SIT) in a high critical temperature cuprate system (Bi(2)Sr(2-x)La(x)CaCu(2)O(8+delta)) exhibits a fundamentally different behavior than is expected from conventional SIT. At the critical doping, the sheet resistance seems to diverge in the zero-temperature limit. Above the critical doping, the transport is universally scaled by a two-component conductance model. Below, it continuously evolves from weakly to strongly insulating behavior. The two-component conductance model suggests that a collective electronic phase-separation mechanism may be responsible for this unconventional SIT behavior.
authors.affiliation: Department of Physics, University of Illinois, Urbana, 61801, USA. soh4@uiuc.edu
authors.forename: Seongshik
authors.initials: S
authors.lastname: Oh
authors.forename: Trevis A
authors.initials: TA
authors.lastname: Crane
authors.forename: D J
authors.initials: DJ
authors.lastname: Van Harlingen
authors.forename: J N
authors.initials: JN
authors.lastname: Eckstein