Physicists find 'ghost' of superconductivity persisting after it disappears
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Physicists at the University of Illinois Urbana-Champaign have found direct evidence that pair density waves — rippling patterns of Cooper-paired electrons — survive in uranium ditelluride even after ordinary superconductivity disappears. First predicted about 20 years ago, PDWs were previously seen only alongside superconductivity in other metals. The finding, published in the Proceedings of the National Academy of Sciences, suggests electron pairs form before the material actually becomes superconducting. "They are the Cheshire Cat's grin of superconductivity," said co-lead Eduardo Fradkin.
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