Experiments on nano-islands of a high-temperature superconductor reveal the presence of a small imaginary component of the superconducting order parameter.
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Deutscher, G. The imaginary is real. Nature Nanotech 8, 10–11 (2013). https://doi.org/10.1038/nnano.2012.245
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DOI: https://doi.org/10.1038/nnano.2012.245