Abstract
63 Cu NQR, 17 O and 205 T1 NMR studies are reviewed for (La 1− x Sr x )CuO 4 , YBa 2 Cu 3 O 7 and Tl 2 Ba 2 CuO 6− y As for the superconducting properties, the temperature dependence of the Knight shift as well as the nuclear spin lattice relax possessing the common unconventional feature for all compounds are consistent with the presence of the larger energy gap in the CuO 2 plane than the BCS prediction. The normal state in the superconducting compound is demonstrated to be predominated by the antiferromagnetic (AF) spin correlation, while for the non-superconducting sample, the AF spin correlation is reduced, suggesting the interrelation between the superconductivity and the AF spin correlation.
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