Fingerprints of electron pairing in a range of temperature and magnetic field above the bulk superconducting phase transition have been found, which may be evidence for the long-sought 'preformed pairs' expected in strongly coupled or very dilute superconductors.
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Edelman, A., Littlewood, P. The persistence of pairs. Nature Mater 14, 565–566 (2015). https://doi.org/10.1038/nmat4305
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DOI: https://doi.org/10.1038/nmat4305
