Measurements of X-ray diffraction on small patches of a copper oxide superconductor reveal that oxygen crystal defects form fractal structures that seem to promote high-temperature superconductivity.
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Zaanen, J. The benefit of fractal dirt. Nature 466, 825–826 (2010). https://doi.org/10.1038/466825a
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DOI: https://doi.org/10.1038/466825a
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