New Form of Superconductor Behavior Discovered That We've Never Seen Before - ScienceAlert
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Materials in a superconducting state are of huge interest to scientists. That's because of rare properties – primarily the ability to conduct electricity with zero resistance, with nothing lost to heat – that promise to transform computing, energy grids, and transport. This phenomenon happens when free electrons condense into a low-energy quantum state at very cold temperatures, pairing up into what are called Cooper pairs so they can zip through materials without interference. Back in 2007, scientists predicted the existence of a more exotic type of electron movement, called a pair density wave (PDW), where the Cooper pairs form specific patterns while moving, like ripples on sand. Now a team led by researchers from the University of Illinois at Urbana-Champaign has found compelling evidence of PDWs on the surface of the metal uranium ditelluride, with their results published in PNAS. What's more, the patterns were found to persist outside of the standard superconducting state, something that's never been seen before. "Pair density waves are the Cheshire Cat's grin of superconductivity," says physicist Eduardo Fradkin from the University of Illinois at Urbana-Champaign.
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