Abstract
We have observed the effects of cation substitution on the charge distribution and superconductivity of Y 1− x Ca x Ba 2Cu 3O y and YBa 2− z La z Cu 3O y . As Ca concentration increases, hole concentration on the CuO 2 plane increases beyond the optimum region due to the hole transfer from the Cu–O chain to the CuO 2 plane. However, it decreases as the holes move from the CuO 2 plane to the Cu–O chain with increasing La concentration. Apical oxygen moves in the opposite direction to the hole transfer for both cases. The hole distribution between the superconducting plane and the charge reservoir is considered to be determined mainly by the environmental ionic configuration including the apical oxygen but not by the movement of the apical oxygen alone.
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