We report a 63 Cu and 17 O NMR study in the high- T c superconductor Tl 2 Ba 2 Ca 2 Cu 3 O 10 with T c (max)=127 K. The results of T 1 and T 2 G reveal that the characteristic energy of the antiferromagnetic spin fluctuation Γ Q is higher than that in YBa 2 Cu 3 O 7 , while the magnetic correlation lengths ξ do not differ much from each other. The high T c in this compound is thus related to large Γ Q , suggesting that the superconductivity is spin fluctuation mediated.
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Zheng et al. (1995) studied this question.
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