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Physicists spot the 'ghost' of superconductivity

So: physicists have found direct evidence of a hidden pattern of electron pairs in uranium ditelluride, even after its superconductivity has disappeared. These pair density waves are like a lingering trace of the superconducting state, and scientists had predicted them nearly 20 years ago. Higher-quality samples let the team detect signatures that respond to temperature and magnetic fields as expected, and persist above the superconducting transition. This discovery offers a fresh clue to how unconventional superconductors behave.
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