Subgap Density of States in Superconductor-Normal Metal Bilayers in the Cooper Limit
Zhenyi Long, M. D. Stewart, Jr., Taejoon Kouh, James M. Valles, Jr.
DOI 10.1103/PhysRevLett.93.257001 · Physical Review Letters
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Abstract
We present transport and tunneling measurements of Pb-Ag bilayers with thicknesses, dPb and dAg, that are much less than the superconducting coherence length. The transition temperature, Tc, and energy gap, Δ, in the tunneling density of states (DOS) decrease exponentially with dAg at fixed dPb. Simultaneously, a DOS that increases linearly from the Fermi energy grows and introduces states within the gap. The integrated subgap DOS approaches 40% of the normal state value in the lowest Tc film investigated (Tc≈0.1 Tc,bulkPb). This behavior suggests that a growing fraction of quasiparticles decouple from the superconductor as Tc→0. The linear dependence is consistent with the quasiparticles becoming trapped on integrable trajectories in the metal layer.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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