Y${}_{1-x}$Pr${}_x$Ba${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals with $x$ = 0.1, 0.2, and 0.3 were grown by the flux method. The temperature dependence of the magnetization with the external magnetic field parallel to the $c$ axis was measured with a superconducting quantum interference device magnetometer. In the thermodynamically reversible region, the magnetization was analyzed and the various thermodynamic parameters were obtained. The upper critical field slope ${\mathrm{dH}}_{c2\mathrm{}}/dT$ near $T_c,$ the zero temperature upper critical field $H_{c2\mathrm{}}\mathrm{}\left(0\right)\mathrm{}$, and the superconducting transition temperature $T_c$ decreased monotonically with increasing Pr concentration. Other parameters such as the Ginzburg-Landau parameter $\kappa$, the penetration depth ${\lambda }_{\mathrm{ab}}\mathrm{}\left(0\right)\mathrm{}$, and the coherence length ${\xi }_{\mathrm{ab}}\mathrm{}\left(0\right)\mathrm{}$ increased with Pr content. The effects of Pr ion on the superconducting properties are discussed.

• Received 11 November 1996

DOI:https://doi.org/10.1103/PhysRevB.56.8381