Proximity-effect tunneling in Pd-Pb sandwiches

L. Dumoulin; P. Nedellec; P. M. Chaikin

doi:10.1103/PhysRevLett.47.208

Proximity-effect tunneling in Pd-Pb sandwiches

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

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Abstract

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 language	English (US)
Pages (from-to)	208-211
Number of pages	4
Journal	Physical Review Letters
Volume	47
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.47.208
State	Published - 1981

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Physics and Astronomy(all)

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10.1103/PhysRevLett.47.208

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abstract = "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.",

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AU - Dumoulin, L.

AU - Nedellec, P.

AU - Chaikin, P. M.

PY - 1981

Y1 - 1981

N2 - 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.

AB - 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.

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JF - Physical Review Letters

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Proximity-effect tunneling in Pd-Pb sandwiches

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