Abstract
Recent NMR measurements on high- T c and related material Sr 2RuO 4 by the Osaka group are reviewed. The following results are presented: (1) Study of YBa 2Cu 3O 7+Ni has revealed that the attractive force is spin in origin. (2) Analysis of T 1, T 2 and Knight shift ( K) in various high- T c materials supports the antiferromagnetic spin-fluctuation mediated superconducting model. (3) Temperatures at which a pseudogap starts to open obtained by 1/ T 1 T, d K/d T, photoemission and resistivity agree with each other in the Bi 2Sr 2CaCu 2O 8+ δ system. (4) 17O Knight shift measurements in the related material Sr 2RuO 4 suggests that a triplet pairing is realized in this compound as in the heavy-fermion superconductor UPt 3.
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