Abstract
Measurement of the Hall coefficient in the Ba/sub 2/Y/sub 1-//sub x/Pr/sub x/Cu/sub 3/O/sub 7-//sub delta/ system has revealed that an increase in Pr concentration reduces the Hall carrier number (1/eR/sub H/) and its strong temperature dependence. The Cu formal valence calculated from the Pr valence, which has been determined to be /similar to/+3.5, shows a weakly decreasing dependence on Pr concentration. T/sub c/ shows a stronger dependence on the Hall carrier number and the Cu-O formal valence than in the oxygen-depleted Ba/sub 2/YCu/sub 3/O/sub 7-//sub delta/ system. The persistence of the chain band explains this observed difference, suggesting that the actual Cu-O valence dependence of the 90-K superconductor is stronger than that of the 40-K superconductor.
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