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The strength of electron-phonon coupling in layered high-temperature superconductors as described by quantum percolation theory can be larger than in ballistic metals as described by BCS theory, but only if the percolation is preceded by local superconductivity. Experimental evidence for such electronic precursors in Y-Ba-Cu-O has recently been observed in ion-channeling experiments.
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J. C. Phillips (1990) studied this question.
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