Large energy gaps in Ca C6 from tunneling spectroscopy: Possible evidence of strong-coupling superconductivity
| Autor: | Kurter, Cihan, Özyüzer, Lütfi, Mazur, Daniel, Zasadzinski, John F., Rosenmann, Daniel, Claus, Helmut, Hinks, David G., Gray, Kenneth E. |
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| Přispěvatelé: | TR5135, Özyüzer, Lütfi, Izmir Institute of Technology. Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
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| Popis: | 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. U.S. Department of Energy, Basic Energy Sciences, Materials Sciences under Contract No. DE-AC02-06CH11357 |
| Databáze: | OpenAIRE |
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