Abstract
We report systematic ${}^{17}\mathrm{O-NMR}$ measurements on the high-${T}_{c}$ cuprate $({\mathrm{Ca}}_{x}{\mathrm{La}}_{1\ensuremath{-}x})({\mathrm{Ba}}_{1.75\ensuremath{-}x}{\mathrm{La}}_{0.25+x}){\mathrm{Cu}}_{3}{\mathrm{O}}_{y}$, for four different families (different $x)$. Using Knight shift data, we show that the pseudogap opening temperature ${T}^{*}$ is much higher than ${T}_{c}$ near optimal doping, unlike structurally similar YBCO. In addition, at constant doping the pseudogap temperature does not vary with $x$, in contrast to ${T}_{c}$. This puts constraints on the nature of the pseudogap and position of the quantum critical point inside the superconducting dome.
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