Abstract
Magnetization measurements have been performed on the oxygen-isotope exchanged samples ( and ) of the one-layer cuprate superconductors . From magnetization measurements on the fine-grained and decoupled samples in the Meissner state, we find substantial oxygen-isotope effects on both the penetration depth and . From normal-state susceptibility measurements, we are able to show that there is a negligible oxygen-isotope effect on the carrier density n. The combined results strongly suggest that there is an oxygen-isotope effect on the effective supercarrier mass , which is huge for x = 0.06, and reduced to a smaller value for x = 0.15. We discuss the isotope effects, supercarrier mass anisotropy, normal-state gap, in-plane penetration depth, and mid-infrared spectra for on the basis of the small polaron theory of superconductivity. We find that the agreement between the calculated and experimental results is excellent without any adjustable parameters.
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