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Flux Flow Instabilities in Microstructured Amorphous Nb0.7Ge0.3 Thin Films | | D. Babic
; J. Bentner
; C. Suergers
; C. Strunk
; | | Date: |
18 Jul 2003 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | 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 Tc the Larkin-Ovchinnikov theory of nonlinear flux flow and the related instability describes the data quantitatively up to ~ 70% of the upper critical magnetic field Bc2 and over a wide electric field range. At lower temperatures the nonlinearities of E(J)can be described by electron heating which reduces Bc2 and leads to a second type of flux flow instability, as shown by a scaling analysis of the high-dissipation data. | | Source: | arXiv, cond-mat/0307463 | | Services: | Forum | Review | PDF | Favorites | |
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