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Flux-flow instabilities in amorphous Nb0.7Ge0.3 microbridges

Babic, D.; Bentner, J.; Sürgers, C.; Strunk, C.

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.

DOI: 10.1103/PhysRevB.69.092510
Zitationen: 37
Web of Science
Zitationen: 35
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2004
Sprache Deutsch
Identifikator ISSN: 1098-0121
KITopen-ID: 1000003281
Erschienen in Physical review / B
Band 69
Heft 9
Seiten 092510
Nachgewiesen in Web of Science
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