Magnetic hysteresis measurements on Pr-doped single crystal Bi2Sr2Ca0.89Pr0.11Cu 2O8+δ show a dimensional crossover from the three-dimensional (3D) vortex glass to the two-dimensional (2D) pancake of vortices. The observed crossover field H2D for field applied parallel to the c-axis decreases from 6 kG at 5 K to 410 G at 25 K and 120 G at 45 K. The substitution of 11% of magnetic Pr3- ions for Ca2- ions effectively decreases the hole concentration on the CuO2 bi-layers but pushes the superconducting state from the overdoped region to the optimum composition with a superconducting transition temperature Tc. of 88 K. The lower crossover field H2D values of the Pr-doped sample as compared with the undoped Bi2Sr2CaCu2O8+δ imply that the Josephson coupling between the two superconducting regions of adjacent CuO2 bi-layers can be reduced by the presence of Pr.
- Dimensional crossover
- Flux dynamics
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering