engleski

Effect of vortex-core size on the flux lattice in a mesoscopic superconducting strip

We present an experimental study of the vortex-motion dissipation in a mesoscopic amorphous ($a$-)Nb$_{; ; ; ; 0.7}; ; ; ; $Ge$_{; ; ; ; 0.3}; ; ; ; $ strip, with emphasis on the results for 3 - 8 vortex rows parallel to the long strip axis. In the isothermal voltage vs magnetic field traces, at a constant current, we observe plateaus superimposed onto a monotonic background. The plateaus appear because finite vortex-core size influences the accommodation of the flux lattice into the strip. This conclusion is drawn from a quantitative analysis, free of adjustable parameters, of the magnetic fields that edge the plateaus.

low-Tc films; mesoscopic and nanoscale systems; Vortex lattices; flux pinning; flux creep

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