Cu NQR Wipeout Effect versus Charge Pseudogap in Zn/Ni Doped NdBa${}_2$Cu${}_3$O${}_{6+y}$

H. -J. Grafe, F. Hammerath, A. Vyalikh +5

We report ${}^{63,65}$Cu NQR measurements on slightly underdoped NdBa${}_2$Cu${}_3$O${}_{6+y}$ single crystals heavily doped by Ni and Zn impurities. Owing to the impurity doping super…