While the explanation of ceramic superconductivity remains elusive, new data serve to eliminate conventional strong coupling between electron pairs andphonons.
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Anderson, P., Abrahams, E. Superconductivity theories narrow down. Nature 327, 363 (1987). https://doi.org/10.1038/327363a0
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DOI: https://doi.org/10.1038/327363a0
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