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Magnetic field dependence of quasiparticle losses in a superconductor
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9.The normal films at the ends of the Al are quasiparticle sinks. We treat the 30 μm overlap between the Al strip and the Ag detector by setting at a distance of 20 μm beyond the start of the Al/Ag interface.
10.There is little relaxation of the injected quasiparticles because the inelastic scattering time is longer than the diffusion time from the far injector to the detector for injector voltages below (Refs. 12 and 13).
11.The total current I exceeds the current due to quasiparticles, because electrons can tunnel into regions of field penetration where they are confined and do not participate in the diffusion process. In nonzero fields, we set equal to I where the latter is measured at the same injector voltage but in zero field. At voltages
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15.The value of current where we match data to theory should lie roughly between 0.3 and 1.2 μA corresponding to injector voltages between and Voltages are unsuitable for fitting because is not well known as described in Ref. 11. Voltages are unsuitable because of the onset of inelastic quasiparticle scattering as described in Ref. 10.
16.The quality of the fits in Fig. 2 deteriorates for the near injector at higher fields. The fits can be improved if the extension of the Al over the Ag is shrunk to 5 μm as the field increases to its maximum value. It is possible that quasiparticles penetrate a shorter distance into the overlap region at higher fields but we have not investigated this possibility quantitatively.
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