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VOLUME 56 (1992) | ISSUE 8 | PAGE 419
Isotope effect as an experimentum crucis for identifying the mechanism for high-Tc superconductivity
The anomalous decrease in the oxygen isotope effect with increasing transition temperature Tc, with the index of the isotope shift of Tc dropping to vanish-ingly low values and even going negative, is characteristic of a plasmon mechanism for superconductivity. A direct experiment is proposed for identifying this mechanism for high-Γ^ superconductivity.