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We report systematic 17O-NMR measurements on the high-Tc cuprate(Ca_xLa_{1-x})(Ba_{1.75 - x}La_{0.25 + x})Cu_3O_y, for four different families(different x). Using Knight shift data, we show that the pseudogap lines forall families are inconsistent with a quantum critical point inside thesuperconducting dome. In addition, at constant doping the pseudogap temperaturedoes not vary with x, in contrast to Tc. We therefore argue that pseudogap andsuperconductivity are separate phenomena in these cuprates. Using Knight shiftdata, we show that the pseudogap opening temperature T* is much higher than Tcnear optimal doping, unlike structurally similar YBCO. In addition, at constantdoping the pseudogap temperature does not vary with x, in contrast to Tc. Thisputs constraints on the nature of the pseudogap and position of the quantumcritical point inside the superconducting dome.

17O-NMR Knight shift study of the interplay between superconductivity and pseudogap in (Ca_xLa_{1-x})(Ba_{1.75 - x}La_{0.25 + x})Cu_3O_y