Quasiparticle scattering time in niobium superconducting films
A. Leo, G. Grimaldi, R. Citro, A. Nigro, S. Pace, R. P. Huebener
DOI 10.1103/PhysRevB.84.014536 · Physical Review B
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Abstract
We study the quasiparticle energy relaxation processes in superconducting Nb films of different thicknesses corresponding to different electron mean-free paths in a nonequilibrium state; that is, the highly dissipative flux-flow state driven up to the instability point. From the measured current-voltage curves we derive the vortex critical velocity v* and the quasiparticle energy relaxation time τε for several temperatures within the Larkin-Ovchinnikov model. Numerical calculations of the quasiparticle energy relaxation rates are also carried out to support the experimental findings. We observe a reduction of the quasiparticle relaxation time along with an almost constant behavior as a function of the temperature below Tc as the electron mean-free path decreases. These features can be associated with an increasing contribution from the electron-phonon process arising from a larger quasiparticle energy scale involved at the vortex instability. Furthermore, for thicker samples the recombination process dominates over scattering processes in the total quasiparticle relaxation.
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. | 7.6 | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.1 | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.7 | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure not reported | unknown |
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