The critical temperature of most superconductors varies with the density of charge carriers, which in turn is most easily tuned by chemical doping. The observation that a specially fabricated two-dimensional superconductor maintains the same critical temperature regardless of doping raises some important questions.
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van der Marel, D. Pinning the critical temperature. Nature Mater 12, 875–876 (2013). https://doi.org/10.1038/nmat3761
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DOI: https://doi.org/10.1038/nmat3761
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