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Large energy gaps in Ca C6 from tunneling spectroscopy: Possible evidence of strong-coupling superconductivity
(American Physical Society, 2007-12)
Tunneling in Ca C6 crystals reproducibly reveals superconducting gaps Δ of 2.3±0.2 meV that are ∼40% larger than reported earlier. In an isotropic s -wave scenario, that puts Ca C6 into the class of very strongly coupled ...