When it comes to superconducting device components, there is no such thing as too thin, but superconductivity has its limits. Now, ultrathin lead films with crystalline perfection have been shown to be able to carry large dissipationless currents down to a thickness of a few monolayers.
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Yazdani, A. Lean and mean superconductivity. Nature Phys 2, 151–152 (2006). https://doi.org/10.1038/nphys256
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DOI: https://doi.org/10.1038/nphys256
