Abstract
63,65Cu NMR and NQR studies of YBa 2Cu 3O 7−δ are described for compositions, δ, of 0.0, 0.3, and 0.9. Spin-lattice relaxation rates in YBa 2Cu 3O 7 reveal significantly different electron dynamics at the two Cu sites in both the normal and superconducting states. In YBa 2Cu 3O 6.7, the relaxation rates of the sites giving a 31 MHz NQR line are dramatically lower (by a factor ∼ 1/1500) than in YBa 2Cu 3O 7 indicating the essential vanishing of mobile carrier density on these sites. In contrast, relaxation at the 22 MHz sites is reduced only about 30%. Interpretation of these and other NMR and NQR data is discussed in relation to the question of assignment of the NQR lines to the appropriate crystalline sites.
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