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The paper reviews some copper NQR studies in the superconductors YBa 2 Cu 3 O x  and YBa 2 Cu 4 O 8  performed at the University of Zürich. The following topics are discussed: the temperature and pressure dependence of the NQR frequencies; relation between linewidths and oxygen deficiency; the determination of the electric field gradients (EFG) and Knight shifts at the copper sites; discussion of some calculations of the EFG tensors; measurements of the various relaxation times in all phases. The results obtained in both structures are compared; possible interpretations are discussed.

Cu NQR Studies of the Superconductors YBa 2 Cu 3 O x and YBa 2 Cu 4 O 8