Pair potential and density of states in proximity-contact superconducting–normal-metal double layers
Jun’ichiro Hara, Masami Ashida, Katsuhiko Nagai
DOI 10.1103/PhysRevB.47.11263 · Physical Review B
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Abstract
The self-consistent pair potential and the density of states in a proximity-contact superconducting-normal (S-N) finite double layer are discussed in the clean limit. The finite reflection coefficient R at the interface is explicitly taken into account. It is shown that the depression of the pair potential near the S-N interface is significant even when the layer width is as small as the coherence length. We assume that there is no pairing interaction in the N side, and as a result there is no pair potential. It is found, however, that the N-side density of states has an effective energy gap. In the S side, the density of states in the energy range below the pair potential is finite and has a remarkable structure in contrast to the bulk superconductor. The nuclear spin-lattice relaxation rate T1−1 is also calculated. The enhancement of T1−1 just below the transition temperature is found on both sides, which qualitatively agrees with experiments.
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 |
| Cu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| InAs 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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