Proximity-effect tunneling in Pd-Pb sandwiches

L. Dumoulin, P. Nedellec, P. M. Chaikin

    Research output: Contribution to journalArticlepeer-review


    Tunneling characteristics of junctions of the form AlOx-Pd-Pb are reported. From the thickness dependences of Tc and the induced gaps we find that the total BCS interaction (NV) in Pd is 0±0.05. We find a Fermi velocity of ∼ 0.2×108 cm/sec indicating that the narrow d-band electrons dominate our measurements. Pd phonon structure is not resolved, setting an upper limit of λ0.2 for the effective electron-phonon interaction. These results indicate that paramagnon effects are substantially less important for superconductivity than was previously envisioned.

    Original languageEnglish (US)
    Pages (from-to)208-211
    Number of pages4
    JournalPhysical Review Letters
    Issue number3
    StatePublished - 1981

    ASJC Scopus subject areas

    • General Physics and Astronomy


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