Abstract
Nuclear electric quadrupole measurements of {sup 63}Cu nuclear spin-lattice relaxation rates ({ital R}{sub 1}) in zero applied magnetic field and nuclear magnetic resonance {ital R}{sub 1} in 8.2 T are reported for YBa{sub 2}Cu{sub 3}O{sub 7} and La{sub 1.85}Sr{sub 0.15}CuO{sub 4}. A direct effect of the magnetic field is seen for the first time both above and below {ital T}{sub {ital c}}. Above {ital T}{sub {ital c}} the effect is ascribed to the partial suppression of antiferromagnetic (AF) spin fluctuations. For {ital T}{lt}{ital T}{sub {ital c}} the effect goes in the opposite sense and may be related to the spin-temperature diffusion for the core of the fluxons or to the enhancement of AF spin fluctuations persisting in the superconducting phase.
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