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The transverse relaxation rate T 2  -1  was measured in YBa 2 Cu 3 O 7  from 4.2 to 100 K in zero magnetic field. It showed a sudden drop just below T c down to 1/3 of that above T c  . A cusp-shaped sharp peak of T 2  -1  was found at 35 K for Cu(2) (plane) site, but not for Cu(l) (chain) site. Except the peak, all the behavior can be interpreted by the model of Pennington et al. that the origin of T 2  -1  at 100 K is mainly the local field fluctuation by the Cu d-electron and secondly the indirect nuclear spin-spin coupling via superexchange interaction between Cu-ions. Below T c  the former is sup-pressed.

Cu NQR Study on Transverse Relaxation Rate below T c in YBa 2 Cu 3 O 7