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Oxygen isotope (^{16}O/^{18}O) effects (OIE's) on the superconductingtransition (T_c), the spin-glass ordering (T_g), and the antiferromagneticordering (T_N) temperatures were studied for Y_1-xPr_xBa_2Cu_3O_7-\delta as afunction of Pr content (0.0\leq x \leq 1.0). The OIE on T_c increases withincreasing x up to x\approx0.55, where superconductivity disappears. Fordecreasing x the OIE's on T_N and T_g increase down to x\approx 0.7 whereantiferromagnetic order and down to x\approx0.3 where spin-glass behaviorvanish, respectively. The OIE's on T_g and T_N are found to have {\it oppositesigns} as compared to the OIE on T_c. All OIE's are suggested to arise from theisotope dependent mobility (kinetic energy) of the charge carriers.

Oxygen isotope effect on superconductivity and magnetism in Y_1-xPr_xBa_2Cu_3O_7-\delta