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Scientists at the U.S. Department of Energy’s Argonne National Laboratory have discovered a previously unknown phase in a class of superconductors called iron arsenides. This sheds light on a debate over the interactions between atoms and electrons that are responsible for their unusual superconductivity.

“This new magnetic phase, which has never been observed before, could have significant implications for our understanding of unconventional superconductivity,” said Ray Osborn, an Argonne physicist and coauthor on the paper.

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