Oxygen-isotope effect on the superconducting gap in the cuprate superconductor Y1-xPrxBa2Cu3O7-δ
Abstract
The oxygen-isotope (16O/18O) effect (OIE) on the zero-temperature superconducting energy gap 0 was studied for a series of Y1-xPrxBa2Cu3O7-δ samples (0.0≤ x≤0.45). The OIE on 0 was found to scale with the one on the superconducting transition temperature. These experimental results are in quantitative agreement with predictions from a polaronic model for cuprate high-temperature superconductors and rule out approaches based on purely electronic mechanisms.
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