Abstract
The irreversibility lines of Pr-doped Br2Sr2Ca1−xPrxCu2Oy single crystals have been studied systematically. It was found that for the Pr-doped samples as compared with the undoped Bi2Sr2CaCu2Oy the effective superconducting area shrinks, the irreversibility line Birr decreases, and the anisotropic parameter γ increases strongly due to Pr doping. It is evident that the substitution of Pr for Ca in the system effectively reduces the hole concentration on CuO2 layers to the underdoped state and destroys the Josephson coupling of the two superconducting regions of adjacent CuO2 layers. The vortex depinning is responsible for the irreversibility and the displacement value for vortex depinning is similar to that for vortex lattice melting, but with different physical meaning.
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