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Abstract

${\mathit{T}}_{\mathit{c}}$ and ${\mathit{T}}_{\mathit{N}}$ (N\'eel) have been measured for a series of ${\mathrm{YBa}}_{2}$(${\mathrm{Cu}}_{0.96}$${\mathrm{Zn}}_{0.04}$${)}_{3}$${\mathrm{O}}_{6+\mathit{x}}$ samples. The T variations of the homogeneous susceptibility ${\mathrm{\ensuremath{\chi}}}_{\mathit{s}}$ of the ${\mathrm{CuO}}_{2}$ planes, given by the shift of the $^{89}\mathrm{Y}$ NMR line, are found to be nearly unchanged with respect to pure samples for x&gt;0.5, which implies that the charge transfer is negligibly modified by Zn, and that the magentic pseudo-gap is not associated with superconducting pairing. Detection of an unusual Curie contribution to the $^{89}\mathrm{Y}$ NMR width for x\ensuremath{\ge}0.5 provides evidence that Zn induces magnetic moments in the ${\mathrm{CuO}}_{2}$ planes, which play a role in the depression of ${\mathit{T}}_{\mathit{c}}$.