abstract

• Current-voltage characteristics were measured in the mixed state of Y1Ba2Cu3O7−δ superconducting films in the regime where flux flow becomes unstable and the differential conductivity dj/dE becomes negative. Under conditions where its negative slope is steep, the j(E) curve develops a pronounced staircaselike pattern. We attribute the steps in j(E) to the formation of a dynamical phase consisting of the successive nucleation of quantized distortions in the local vortex velocity and flux distribution within the moving flux matter. © 2001 The American Physical Society.

authors

• Ivlev Boris
• Knight J.M.
• Kunchur M.N.

publication date

• 2001-01-01

published in

• Physical Review Letters  Journal

keywords

• Current voltage characteristics; Electric conductivity; Electric distortion; Nucleation; Vortex flow; Yttrium barium copper oxides; Negative-differential-conductivity; Superconducting films

Digital Object Identifier (DOI)

• 10.1103/PhysRevLett.87.177001

start page

end page

volume

• 87

issue

• 17