Abstract
0.33–33% of the Cu in superconducting YBa2Cu3O y has been replaced by Li (i.e.,x=0.01–1 in single-phase or nominal YBa2Cu3−x LixOy). X-ray diffraction powder patterns remain the same as for YBn2Cu3O y , with identical patterns up to about 17% substitution (i.e.,x=0.5). At higher percentages an additional phase appears. Electrical conductivity measurements indicate a small elevation ofT c at low Li content. Starting at about 5% Li (x=0.15),T c declines progressively and its width increases asx is raised.
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