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Phonon-drag thermopower correlations to Tc in superconducting SrxNd1-xCuO2- delta : Evidence for phonon-mediated pairing in the high-Tc parent compounds.

The {ital A}CuO{sub 2} compounds---containing only CuO{sub 2} planes separated by {ital A} ions---are the basic ``building blocks`` of the more complex high-{ital T}{sub {ital c}} superconductors. Trivalently doped Sr{sub {ital x}}Nd{sub 1{minus}{ital x}}CuO{sub 2{minus}{delta}} thin films are shown to superconduct with the appearance of a phonon-drag contribution to the thermopower at the superconducting doping threshold. A monotonic increase in this phonon-drag contribution with {ital T}{sub {ital c}} suggests that electron-phonon interactions play an important role in the pairing mechanism. A correlation between the deduced BCS coupling constants and {ital T}{sub {ital c}} is consistent with strong-coupling theory.