Abstract
The 63 Cu spin-lattice relaxation rate has been measured in an annealed sample of Tl 2 Ba 2 Ca 2 Cu 3 O 10 with T c =123 K, and compared with that in the previously reported as-grown sample with T c = 115 K. We found, for the first time, that T c increases as a result of a decrease in the residual density of states (DOS), N res , at the Fermi level due to the improvement of crystal ordering by annealing . Based on the T 1 result, N res normalized by the value at T c , N res / N 0 , was found to be reduced from 0.30 to 0.18 after annealing. A 2-dimensional d-wave superconductivity model accounts for the increase of T c in terms of the change in potential scattering due to crystal imperfection, which is probably caused by Ca/Tl inter-substitution.
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