Abstract
Pulsed NMR data for 89Y in the high- T c superconductor YBa 2 Cu 3 O 9- δ (δ ≈ 2.1) in both the normal and mixed states are presented. Spin-lattice relaxation exhibits a Korringa temperature dependence in the normal state, with T 1 T = (4.6 ± 0.1) × 10 3 s- K. Below T c , T 1 increases much more quickly than for a conventional superconductor. From linewidth measurements, the zero-field penetration depth is estimated to be λ ≈ 3800 Å. The Knight shift in the normal state is small, K ≈ 0.02%. Spin-spin relaxation times, determined by Y-Cu dipolar interactions, decrease below T c due to the detuning of Cu-Cu interactions by fluxoid field gradients.
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