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Summary: Edge and Bulk Transport in the Mixed State of a Type-II Superconductor
Z. L. Xiao*, E. Y. Andrei*, Y. Paltiel
, E. Zeldov
, P. Shuk
, and M. Greenblatt
*Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855
Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
Department of Chemistry, Rutgers University, Piscataway, New Jersey 08854
By comparing the voltage-current (V - I) curves obtained before and after cutting a sample of 2H-
NbSe2, we separate the bulk and edge contributions to the transport current at various dissipation
levels and derive their respective V - I curves and critical currents. We find that the edge contribu-
tion is thermally activated across a current dependent surface barrier. By contrast the bulk V - I
curves are linear, as expected from the free flux flow model. The relative importance of bulk and
edge contributions is found to depend on dissipation level and sample dimensions. We further show
that the peak effect is a sharp bulk phenomenon and that it is broadened by the edge contribution.
PACS numbers: 74.25.Fy, 74.60.Ge, 74.60.Jg, 74.60.Ec
One of the remarkable differences between a normal
metal and a superconductor stems from the way they
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