Volume 46, Number 5, June I 1999
|Page(s)||678 - 684|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Normal-state magnetic properties of Ni and Zn substituted in : Hole-doping dependence
Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud
91405 Orsay Cedex, France
2 Laboratoire Léon Brillouin, CE Saclay, CEA-CNRS - 91191 Gif-sur-Yvette, France
3 Laboratoire des Composés Non Stoechiométriques, Université Paris-Sud 91405 Orsay Cedex, France
Accepted: 22 March 1999
We present SQUID susceptibility data on Zn and Ni substituted . Cross-checks with NMR yield an unprecedented accuracy in the estimate of the magnetic susceptibility associated with the substituents, from the underdoped to the lightly overdoped case. This allows us to determine the Weiss temperature for YBCO: its value is very small for all hole dopings nh. Since in conventional metals the Kondo temperature , magnetic screening effects would not be expected for ; in contrast, increasing nh produces a reduction of the small moment induced by Zn2+ and a nearly constant effective moment for corresponding to a spin 1/2 rather than to a spin 1.
PACS: 74.25.-q – General properties; correlations between physical properties in normal and superconducting states / 74.25.Ha – Magnetic properties / 74.62.Dh – Effects of crystal defects, doping and substitution
© EDP Sciences, 1999
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