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We report $^{63,65}$Cu NQR measurements on slightly underdopedNdBa$_{2}$Cu$_{3}$O$_{6+y}$ single crystals heavily doped by Ni and Znimpurities. Owing to the impurity doping superconductivity is fully suppressedin both cases. The Ni strongly enhances magnetic correlations and induces awipeout of the NQR signal comparable to that found in stripe ordered lanthanumcuprates. In contrast, the magnetism is suppressed in the Zn doped sample whereno wipeout effect is observed and the nuclear spin relaxation rate is reduced.Our findings are in a striking correspondence with the different impact of Niand Zn impurities on the charge pseudogap evidenced by recent optical data,uncovering thereby a close relationship between the magnetic correlations andpseudogap phenomena.

Cu NQR Wipeout Effect versus Charge Pseudogap in Zn/Ni Doped NdBa$_{2}$Cu$_{3}$O$_{6+y}$