According to a new empirical law, the transition temperature to superconductivity is high in copper oxides because their metallic states are as viscous as is permitted by the laws of quantum physics.
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Zaanen, J. Why the temperature is high. Nature 430, 512–513 (2004). https://doi.org/10.1038/430512a
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DOI: https://doi.org/10.1038/430512a
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