Abstract
We investigate the effects of electron correlation on the nuclear spin-lattice relaxation rate ( T 1 -1 ) and the Knight shift of high- T c superconductors. The main effects are a quasiparticle damping and the vertex enhancement of a spin susceptibility. The former involves a pair breaking effect induced by electron correlation, and brings about the suppression of the coherence peak. The latter is reduced by increasing gap below T c , and results in the sharp decrease of T 1 -1 and the Knight shift. Taking into account these effects, we fit the temperature dependence of these quantities to the experimental results by assuming s -wave or d -wave BCS-like superconductivity. For d -wave pairings, good fits can be obtained. In contrast, it is rather difficult to achieve a fit for s -wave pairings.
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