ac Long-Range Phase-Coherent Effects in Mesoscopic Superconductor–Normal Metal Structures
Anatoly F. Volkov, Hideaki Takayanagi
DOI 10.1103/PhysRevLett.76.4026 · Physical Review Letters
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Abstract
We calculate the conductance of a normal metal film (N) in contact with two superconductors (S) in the presence of a constant (V¯S) and oscillating (Vωcosωt) bias voltage between N and S. It is shown that the conductance as a function of V¯S has a Shapiro-like step at V¯S=ħω/2e. This exists even in the case when the spacing between two superconductors largely exceeds the coherence length in the normal metal, and the critical Josephson current is exponentially small. The amplitude of the Shapiro step decreases slowly with increasing temperature T in the form of T−1.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb 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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