For more than a century, physicists have pondered the origin of superconductivity—the ability of certain materials to conduct electricity without resistance. Today, conventional superconductivity is fairly well understood, but other forms of the phenomenon remain mysterious. Debmalya Chakraborty and Annica Black-Schaffer at Uppsala University, Sweden, have proposed an experimental probe for one type of unconventional superconductivity [1]. The researchers hope that their technique will lead to a much better understanding of the phenomenon.
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