Quantum Tug-of-War Limits High-Temperature Superconductivity - Mirage News
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New work helps show why the dream of high-temperature superconductivity has been so hard to realize: a quantum brawl between superconductivity and a competing state of matter. The finding resulted from a collaboration that included theorists with the Simons Foundation's Flatiron Institute in New York City and experimentalists at Quebec's Institut national de la recherche scientifique (INRS). The researchers investigated a copper alloy called a 'cuprate' as it transitioned from the superconducting state to an enigmatic neighboring state of matter called the 'pseudogap.' Using laser pulses and computer simulations, they were able to understand the behavior of electrons inside the cuprate. In a paper published October 20 in Nature Physics , the team shows how the two states — superconductivity and the pseudogap — wrestle for dominance. That finding challenges the idea that superconductivity in cuprates merely builds upon a pre-existing pseudogap phase. "We're really showing that these states are competing," says study co-author Olivier Gingras , an associate research scientist at the Flatiron Institute's Center for Computational Quantum Physics (CCQ).
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