Resistivity study of Bi2Sr2Ca1−xYxCu2O8 single crystals

Abstract

We have measured the resistivity ρ(T) on a number of high-quality single crystals of ${\mathrm{Bi}}_2$ ${\mathrm{Sr}}_2$ ${\mathrm{Ca}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Y}}_{\mathit{x}}$ ${\mathrm{Cu}}_2$ ${\mathrm{O}}_8$ with x ranging from 0 to 0.50. The effects of increasing x are (1) ${\mathit{T}}_{\mathit{c}}$ falls sharply and disappears at x=0.40±0.05, (2) the onset of linear behavior in ρ(T) shifts to higher temperatures, (3) the high-temperature slope dρ(T)/dT increases, and (4) the residual resistivity ${\mathrm{\rho }}_0$ (normalized to the carrier density) satisfies Matthiessen’s rule up to x=0.40. Localization effects sets in above this value.