Abstract
Lithium substitutes copper of the YBCO-structure inducing specific magnetic effects which depend on the concentration range and on the oxygenation degree. With the increase of Li-content and oxygen deficiency, Tc decreases and the normal state resistivity increases. The susceptibility of the air-annealed and moderately concentrated samples obeys the Curie or modified Curie law showing the formation of magnetic moments around the lithium ions with 0,45μ B/at.Li. The results are compared with the local magnetic properties previously investigated by 7Li NMR experiments.
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