Weak ferromagnetic order and possible high-T$_{c}$ superconductivity in the new RuCa$_{2}$PrCu$_{2}$O$_{8+\delta}$ ruthenium-cuprate

Weak ferromagnetic order with ordering temperature T$_{m} \quad \sim $ 47 K and possible superconducting transition with T$_{c} \quad \sim $ 37 K are observed for the new ruthenium-cuprate RuCa$_{2}$PrCu$_{2}$O$_{8+\delta }$ with the orthorhombic distortion of the tetragonal RuSr$_{2}$GdCu$_{2}$O$_{8+\delta }$-type (with T$_{m} \quad \sim $ 136 K and T$_{c}$(max) $\sim $ 65 K) phase. Anomalous temperature dependent magnetization M$_{m}$(T) in both field-cooled (FC) and zero-field-cooled (ZFC) modes and isothermal magnetic hysteresis M$_{m}$(B$_{a})$ below and above T$_{m}$ and T$_{c}$ indicates a very complicated coexistence and interplay between weak-ferromagnetic order and possible superconductivity.