NMR study of high-T-c superconductors and related materials

Recent NMR measurements on high-ir, and related material Sr2RuO4 by the Osa ka group are reviewed. The following results are presented: (1) Study of YB a2Cu3O7, + 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 s upports the antiferromagnetic spin-fluctuation mediated superconducting mod el. (3) Temperatures at which a pseudogap starts to open obtained by 1/T1T, dK/dT, photoemission and resistivity agree with each other in the Bi2Sr2Ca Cu2O8 + delta system. (4) O-17 Knight shift measurements in the related mat erial Sr2RuO4 suggests that a triplet pairing is realized in this compound as in the heavy-fermion superconductor UPt3. (C) 1999 Published by Elsevier Science B.V. All rights reserved.