Abstract
{ital T}{sub {ital c}} and {ital dT}{sub {ital c}}/{ital dP} have been systematically measured for fully oxygenated {ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} ({ital R}-123) with {ital R}=Yb, Tm, Ho, Dy, Gd, Sm, and Nd. {ital T}{sub {ital c}} has been observed to increase from 88 to 94 K with increasing radius of the {ital R} ion ({ital r}) from 0.98 to 1.12 A. Based on the lattice strains and our {ital dT}{sub {ital c}}/{ital dP} data, we have calculated {ital T}{sub {ital c}} for the series of {ital R}-123 and compared them with the measured {ital T}{sub {ital c}}. Good agreement between the experimental and the calculated results strongly suggests that the {ital R} effect on {ital T}{sub {ital c}} in {ital R}-123 originates from the strain-induced charge redistribution between the charge reservoir and the CuO{sub 2} plane.
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