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Point-contact spectroscopy deepens mystery of heavy-fermion superconductors Theoretical understanding of heavy-fermion superconductors has just slipped a notch or two, says a team of experimentalists.Researchers from the University of Illinois at Urbana-Champaign and Los Alamos National Laboratory recently used a sensitive technique called point-contact spectroscopy to explore Andreev reflection between a normal metal and a heavy-fermion superconductor. Conventional theories cannot account for their data, the scientists report.
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