INVESTIGATION OF SUPERCONDUCTING AND NORMAL-STATE PROPERTIES OF RE(1-X)PR(X)BA(2)CU(3)O(7-Y)SYSTEMS - ANOMALOUS CRITICAL MAGNETIC-FIELDS INGD1-XPRXBA2CU3O7-Y

T-C(x), R(T), (X)(T) and H-C2(T) dependencies have been measured for t he high-T-C systems RE(1-x)Pr(x)Ba(2)Cu(3)O(7-y) (RE=Nd, Sm, Eu, Gd, D y, Ho, Er, Tm, Y; 0.0 less than or equal to x less than or equal to 1. 0) in magnetic fields up to 150kOe. The values of \partial derivative T-C/partial derivative x\(x=0) and Pr-impurity contribution to the res istivity are strongly dependent on the RE(3+) ionic radius. For Gd-bas ed system \partial derivative H-C2/partial derivative T\ derivative re aches 170 kOe/K, the value comparable with ones typical for heavy ferm ion systems. Our very recent results for Gd1-xPrxBa2Cu3O7-y single cry stals are also proposed.