CU-63-NMR STUDY IN HIGH-T-C SUPERCONDUCTOR HGBA2CA2CU3O8+DELTA

The Cu-63 nuclear transverse relaxation rates have been measured in th e normal state on both square and pyramidal CuO2 planes in HgBa2Ca2Cu3 O8+delta with T-c = 133 K. The Gaussian component of the spin-echo dec ay rate, (63)(1/T-2G), for both sites increases with decreasing temper ature, followed by a peak around T similar to 150 K, indicating that the spin correlation becomes stronger with decreasing temperature. Als o, it is found that the magnitude of (63)(1/T-2G) for a square site is larger than that for a pyramidal one, suggesting that the spin correl ation in the square plane is stronger than that in the pyramidal one.