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This study confirms the long-predicted persistence of pair density waves in uranium ditelluride after superconductivity vanishes, offering critical new data on unconventional superconducting phases. The observation relies on advanced vector magnetic field scanning tunneling microscopy to detect these subtle quantum patterns across multiple crystal orientations. These findings advance fundamental understanding of electron condensation and the topological nature of superconducting states.

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Quantum Cooper pairs linger in uranium ditelluride post-superconductivity

Quantum ZeitgeistOctober 7, 20265 min read

Uranium ditelluride exhibits unusual behavior: Cooper pairs, essential for superconductivity, form pair density waves even after superconductivity vanishes at 20 years post-prediction.

Physicists at the University of Illinois Urbana-Champaign’s Grainger College of Engineering have observed Cooper pairs persisting in the metal uranium ditelluride even after superconductivity ceases. These pairs organize into patterns called pair density waves, predicted two decades ago but never before directly observed to remain once superconductivity vanishes. “Pair density waves are the Cheshire Cat’s grin of superconductivity,” explains Eduardo Fradkin, an Illinois Grainger Engineering physics professor and project co-lead; they are a vestige of the superconducting phase itself. This research, published in the Proceedings of the National Academy of Sciences, offers new insight into unconventional superconductivity and…

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