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We present SQUID susceptibility data on Zn and Ni substitutedYBa_{2}Cu_{3}O_{6+x}. Cross-checks with NMR yield an unprecedented accuracy inthe estimate of the magnetic susceptibility associated with the substituants,from the underdoped to the lightly overdoped case. This allows us to determinethe Weiss temperature \theta for YBCO: its value is very small for all holedopings n_h. Since in conventional metals, the Kondo temperature,$T_{K}<\theta$, magnetic screening effects would not be expected for $T\gg\theta$; in contrast, increasing n_h produces a reduction of the small momentinduced by Zn^{2+} and a nearly constant effective moment for Ni^{2+}corresponding to a spin 1/2 rather than to a spin 1.Comment: 4 pages, 5 figures, to be published in Europhysics Letter

Normal-state magnetic properties of Ni and Zn substituted in YBa 2 Cu 3 O 6 + x : Hole-doping dependence

Normal-state magnetic properties of Ni and Zn substituted in YBa ₂ Cu ₃ O _{6 + x} : Hole-doping dependence