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Citation - WoS: 19
Citation - Scopus: 25
Large Energy Gaps in Ca C6 From Tunneling Spectroscopy: Possible Evidence of Strong-Coupling Superconductivity
(American Physical Society, 2007) Kurter, Cihan; Özyüzer, Lütfi; Mazur, Daniel; Zasadzinski, John F.; Rosenmann, Daniel; Claus, Helmut; Hinks, David G.; Gray, Kenneth E.
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 superconductors, since 2Δ k Tc ∼4.6, implying that soft Ca phonons are primarily involved in the superconductivity. This conclusion explains the relatively large Ca isotope effect found recently for Ca C6, but it could also signal a strong anisotropy in the electron-phonon interaction.

Physics / Fizik