The comparable effects on transport properties in Bi2Sr2Ca1−xPrxCu2Oy and Bi2Sr2Ca1−xYxCu2Oy single crystals

Abstract The in-plane resistivity ρ ab ( T ) of single crystals Bi 2 Sr 2 Ca 1− x Pr x Cu 2 O y ( x ranging from 0 to 0.5) and Bi 2 Sr 2 Ca 1− x Y x Cu 2 O y ( x ranging from 0 to 0.41) has been measured. The doping has dramatic effects on the two systems. In the Pr doped system, T c is suppressed gradually upon doping while the residual resistivity increases strongly. A superconductor–insulator transition is observed when the Pr content reaches about 0.5. In the Y doped system, it is found that ρ ab ( T ) deviates from T -linear behavior at a characteristic temperature T *, which is an evidence of a pseudogap. T * increases with the increase of Y doping. T c is suppressed more rapidly in this system than in the Pr doped system. We suppose that a general correlation exists between anomalous Pr magnetism and a lack of pseudogap in the Pr doped system.