Abstract
Abstract Recently, large values and rapid variation upon doping of the oxygen isotope coefficient β 0 have been observed in the copper oxides. We show that such effects can be understood, qualitatively, in a model with a rapidly varying electronic density of states in which the pairing is mainly due to an electronic mechanism with only a relatively small, additional electron-phonon contribution. By contrast, a pure phonon model is inconsistent with the existing data.
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