Evidence of Strong-Coupled Superconductivity in CaC6 from Tunneling Spectroscopy

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dc.creatorKurter, C.
dc.creatorOzyuzer, L.
dc.creatorMazur, Daniel
dc.creatorZasadzinski, J. F.
dc.creatorRosenmann, D.
dc.creatorClaus, H.
dc.creatorHinks, D. G.
dc.creatorGray, K. E.
dc.date2006-12-22
dc.date2007-04-26
dc.date.accessioned2026-07-07T09:24:46Z
dc.date.available2026-07-07T09:24:46Z
dc.descriptionPoint-contact tunneling on CaC$_6$ crystals reproducibly reveals superconducting gaps, $Δ$, of 2.3$\pm$0.2 meV which are $\sim$~40% larger than earlier reports. That puts CaC$_6$ into the class of very strong-coupled superconductors since 2$Δ$/kT$_c\sim$~4.6. Thus soft Ca phonons will be primarily involved in the superconductivity, a conclusion that explains the large Ca isotope effect found recently for CaC$_6$. Consistency among superconductor-insulator-normal metal (SIN), SIS and Andreev reflection (SN) junctions reinforces the intrinsic nature of this result.
dc.description2nd version, 4 pages, 4 figures, re-submitted to Physical Review Letters
dc.identifierhttps://arxiv.org/abs/cond-mat/0612581
dc.identifierhttp://arxiv.org/abs/cond-mat/0612581
dc.identifierPhys. Rev. B 76, 220502(R) (2007)
dc.identifierdoi:10.1103/PhysRevB.76.220502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/156179
dc.subjectSuperconductivity
dc.titleEvidence of Strong-Coupled Superconductivity in CaC6 from Tunneling Spectroscopy
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