Abstract
We found a nearly \(\sqrt {T}\) dependence of the planar 63 Cu nuclear spin-lattice relaxation rate 1/ T 1 for the 63 Cu-enriched overdoped La 2- x Sr x CuO 4 ( x =0.23; T c ∼20 K), using the 63 Cu NMR spin-echo technique. Considering both the transport and the magnetic properties, we conclude that the overdoped compound with x =0.23 is a three-dimensional nearly antiferromagnetic metal. The results indicate that a crossover in the antiferromagnetic spin fluctuation spectrum from two to three dimensions occurs as the Sr content increases beyond x ∼0.20. This is consistent with the dimensional crossover in conduction suggested from the results of electrical resistivity measurements.
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