Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/2039
Title: Large energy gaps in Ca C6 from tunneling spectroscopy: Possible evidence of strong-coupling superconductivity
Authors: Kurter, Cihan
Özyüzer, Lütfi
Mazur, Daniel
Zasadzinski, John F.
Rosenmann, Daniel
Claus, Helmut
Hinks, David G.
Gray, Kenneth E.
Keywords: Tunneling (Physics)
Energy gap
Tunneling spectroscopy
Issue Date: Dec-2007
Publisher: American Physical Society
Source: Kurter, C., Özyüzer, L., Mazur, D., Zasadzinski, J. F., Rosenmann, D., Claus, H., Hinks, D. G., and Gray, K. E. (2007). Large energy gaps in Ca C6 from tunneling spectroscopy: Possible evidence of strong-coupling superconductivity. Physical Review B - Condensed Matter and Materials Physics, 76(22). doi:10.1103/PhysRevB.76.220502
Abstract: 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.
URI: http://doi.org/10.1103/PhysRevB.76.220502
http://hdl.handle.net/11147/2039
ISSN: 1098-0121
1098-0121
1550-235X
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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