The nuclear-spin-relaxation rates in high-${\mathit{T}}_{\mathit{c}}$ cupric oxide superconductors are calculated from the (phenomenological) boson-fermion model. It is shown that the model is consistent with the experimental data for both Cu and O sites, in the superconducting as well as in the normal phase.

• Received 30 August 1991

DOI:https://doi.org/10.1103/PhysRevB.45.10732