Abstract
89Y NMR shifts Δ K and 63Cu NQR spin lattice relaxation rate T −1 1 in YBCO-family superconductors with different transition transition temperatures T c are used to analyze the possible role of the Cu 2+ magnetic correlations and spin dynamics in driving the superconducting transition. The changes in T c are obtained by varying the oxygen stoichiometry or by Ca doping in YBa 2Cu 4O 8 or by Zn for Cu substitutions in YBa 2Cu 3O 7−δ. From 89Y ΔK and 63Cu(2) NQR T 1 no sizeable modifications either in the statio (spin susceptibility) or in the dynamic ( q-integrated low frequency dynamical susceptability) properties of Cu 2+ spins in the CuO 2 plane are inferred and therefore it is argued that the superconducting transition is not directly related to them.
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