Abstract
A new class of metals has been found in which the electrons have effective masses orders of magnitude larger than the free-electron mass. Some of these metals are superconducting at low temperatures. This superconductivity seems to be unconventional, with an underlying mechanism different from that in all other known superconductors.
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Fisk, Z., Ott, H., Rice, T. et al. Heavy-electron metals. Nature 320, 124–129 (1986). https://doi.org/10.1038/320124a0
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DOI: https://doi.org/10.1038/320124a0
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