Abstract
The T c of the superconductor Bi 2 Sr 2 CaCu 2 O 8+δ changes over about 40 K upon annealing at 600°C at partial oxygen pressures between 10 −7 and 10 1.7 bar. The oxygen content slightly increases with increasing partial oxygen pressure. This change is too small to affect the formal density of holes and consequently the T c is independent of the formal copper valence. However, the small increase in oxygen content causes a significant decrease in the c -axis while the a -axis remains constant. This indicates that the T c is correlated with a redistribution of holes between the Bi 2 O 2+δ layers and the CuO 2 planes. This interpretation is supported by the unambiguous relation between T c and c -axis lattice constant.
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