Magnetotransport in Bi2Sr2Ca1-xYxCu2O8+delta single crystals: From the underdoped to the overdoped regime

We report on magnetotransport measurements (B parallel to c) in Bi 2212 sin gle crystals for both overdoped and underdoped regions. Modification of car rier concentration induces dramatic changes in the temperature dependence o f the zero-field resistivity and longitudinal (B parallel to I) out-of-plan e magnetoconductivity. A change of sign in the longitudinal out-of-plane ma gnetoconductivity occurs in the underdoped to optimally doped region wherea s no change of sign is observable in the overdoped region. A qualitative di scussion is proposed on the basis of various scenarios such as the renormal ization of the interlayer hopping rate or field induced suppression of the pseudogap. Finally, we carry out a quantitative description in terms of sup erconducting fluctuations conductivity to account for experimental data. [S 0163-1829(99)03441-4].