The electrical current that can be carried by a high-temperature superconductor is known to be sharply reduced by grain boundaries in the superconductor. A state-of-the-art calculation shows that this arises because of the accumulation of charge at the grain boundary.
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Freericks, J. Guilty as charged. Nature Phys 6, 559–560 (2010). https://doi.org/10.1038/nphys1739
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DOI: https://doi.org/10.1038/nphys1739
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