Abstract
At a series of oxygen deficient YBa 2 Cu 3 O 7− δ polycrystals with 0≲ δ ≲0.6 the temperature dependent magnetic susceptibility was investigated at temperatures above the critical temperature T c . Fitting these data to a Curie-Weiss-law χ ( T )= C /( T − Θ )+ χ 0 provides a method to derive the number of Bohr magnetons μ B per Cu 2+ ion in the Cu-O chains. Considering nearly full stoichiometric samples with δ ≈0, this quantity is in accordance with the value normally found in Cu 2+ compounds, but it decreases with increasing δ. The increase of the temperature independent part χ 0 of the susceptibility with the oxygen stoichiometry 7− δ is correlated with an increase of the density of states N ( E F ) at the Fermi level E F and provides a presupposition for a rising occupation of conducting charge carriers with the oxygen content.
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