The energy gap associated with Cooper pair formation in unconventional superconductors can fall to zero along lines of the Fermi surface. Differences in the shape and location of these lines bear information on the interaction that triggers Cooper pair formation.
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Lee, DH. Nodal rings. Nature Phys 8, 364–365 (2012). https://doi.org/10.1038/nphys2301
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DOI: https://doi.org/10.1038/nphys2301
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