SPIN CORRELATION IN HIGH-T-C CUPRATE HGBA2CA2CU3O8-C=133 K - AN ORIGIN OF T-C-ENHANCEMENT EVIDENCED BY CU-63-NMR STUDY(DELTA WITH T)

The Knight shift, the nuclear spin-lattice relaxation rate, 1/T-1, and the transverse relaxation rate, 1/T-20, of (CU)-C-63 have been separa tely measured for the square and the pyramidal CuO2 planes in HgBa2Ca2 Cu3O8+delta (Hg1223) with the highest transition temperature, T-c = 13 3 K to date. From the quantitative analysis of 1/T-1 and 1/T-2G, it is shown that the product of the staggered susceptibility and the charac teristic energy of spin fluctuations around a zone boundary, chi(Q) Ga mma(Q) for the square CuO2 plane site is larger than that for YBa2Cu3O 7 (YBCO7), although that for the pyramidal CuO2 plane site is almost t he same. This enhancement of chi(Q) Gamma(Q) for the square site is co nsidered to be responsible for the higher T-c in Hg1223 than in YBCO7.