Cu NQR Wipeout Effect versus Charge Pseudogap in Zn/Ni Doped NdBa2Cu3O6+y

single crystalsheavily doped by Ni and Zn impurities. Owing to the impurity doping superconductivity is fullysuppressed in both cases. The Ni strongly enhances magnetic correlations and induces a wipeoutof the NQR signal comparable to that found in stripe ordered lanthanum cuprates. In contrast,the magnetism is suppressed in the Zn doped sample where no wipeout effect is observed andthe nuclear spin relaxation rate is reduced. Our findings are in a striking correspondence withthe different impact of Ni and Zn impurities on the charge pseudogap evidenced by recent opticaldata, uncovering thereby a close relationship between the magnetic correlations and pseudogapphenomena.