Zusammenfassung
We report measurements of the electric field vs current density [E(J)] characteristics in the mixed state of amorphous Nb0.7Ge0.3 microbridges. Close to the transition temperature T-c the Larkin-Ovchinnikov theory of nonlinear flux flow and the related instability describes the data quantitatively up to similar to70% of the upper critical magnetic field B-c2 and over a wide electric-field range. ...
Zusammenfassung
We report measurements of the electric field vs current density [E(J)] characteristics in the mixed state of amorphous Nb0.7Ge0.3 microbridges. Close to the transition temperature T-c the Larkin-Ovchinnikov theory of nonlinear flux flow and the related instability describes the data quantitatively up to similar to70% of the upper critical magnetic field B-c2 and over a wide electric-field range. At lower temperatures the nonlinearities of E(J) can be described by electron heating which reduces B-c2 and leads to a second type of flux flow instability, as shown by a scaling analysis of the high-dissipation data.
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