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We investigate the specific influence of structural disorder on thesuppression of antiferromagnetic order and on the emergence of cupratesuperconductivity. We single out pure disorder, by focusing on a series ofY$_{z}$Eu$_{1-z}$Ba$_2$Cu$_3$O$_{6+y}$ samples at fixed oxygen content$y=0.35$, in the range $0\le z\le 1$. The gradual Y/Eu isovalent substitutionsmoothly drives the system through the Mott-insulator to superconductortransition from a full antiferromagnet with N\'eel transition $T_N=320$ K at$z=0$ to a bulk superconductor with superconducting critical temperature$T_c=18$ K at $z=1$, YBa$_2$Cu$_3$O$_{6.35}$. The electronic properties arefinely tuned by gradual lattice deformations induced by the different cationicradii of the two lanthanides, inducing a continuous change of the basal Cu(1)-Ochain length, as well as a controlled amount of disorder in the activeCu(2)O$_2$ bilayers. We check that internal charge transfer from the basal tothe active plane is entirely responsible for the doping of the latter and weshow that superconductivity emerges with orthorhombicity. By comparingtransition temperatures with those of the isoelectronic clean system wedeterime the influence of pure structural disorder connected with the Y/Eualloy.

Singling out the effect of quenched disorder in the phase diagram of cuprates