Abstract
We report measurements of the oxygen isotope effect in high-temperature superconductors. We extend previous oxygen isotope measurements to high hole concentrations and show that the data can be analyzed in terms of a hole-concentration-independent oxygen isotope effect in the overdoped region. Measurements of the oxygen isotope effect in ${\mathrm{YBa}}_{2}{(\mathrm{C}\mathrm{u}}_{1\ensuremath{-}x}{\mathrm{Ni}}_{x}{)}_{4}{\mathrm{O}}_{8}$ are also presented. We show that the hole-concentration- and impurity-concentration-induced changes in the isotope-effect coefficient can be consistently modeled by including the effect of the normal-state pseudogap.
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