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VOLUME 54 (1991) | ISSUE 3 | PAGE 154
Spin-spin relaxation of 63Cu(2) nuclei in connection with localized Cu2+(2) centers in YBa2Cu3O7-y
The spin-spin relaxation of copper nuclei has been studied at NQR frequencies in YBa2Cu307 __ y in weak magnetic fields at 4.2 K. Structural features observed in the relaxation of 63Cu (2) nuclei in both compounds are explained as resulting from a spin-spin interaction of resonating Cu (2) nuclei with Си2 + (2) centers localized nearby. It is suggested that the NQR of copper is observed in Zhang-Rice singlet states.