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The most direct evidence so far that Cooper pairs of electrons can exist in a material above the critical temperature for superconductivity has been claimed by Koen Bastiaans and Milan Allan of Leiden University in the Netherlands and colleagues. Their work builds on previous research suggesting that electron pairs could be responsible for the mysterious pseudogap state in unconventional superconductors. In the new work, however, researchers have detected Cooper pairs in a superconductor above the critical temperature, but without a pseudogap.

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