Where does the transport current flow in Bi2Sr2CaCu2O8 crystals?

Details Where does the transport current flow in Bi2Sr2CaCu2O8 crystals? Where does the transport current flow in Bi2Sr2CaCu2O8 crystals?

1997-11-26

arxiv.org/abs/cond-mat/9711284v1

Nature, Volume 391, page 373, (1998).

Physics

Condensed Matter

Superconductivity

11 pages, 4 figures, accepted for publication in Nature

Scientific paper

A new measurement technique for investigation of vortex dynamics is introduced. The distribution of the transport current across a crystal is derived by a sensitive measurement of the self-induced magnetic field of the transport current. We are able to clearly mark where the flow of the transport current is characterized by bulk pinning, surface barrier, or a uniform current distribution. One of the novel results is that in BSCCO crystals most of the vortex liquid phase is affected by surface barriers resulting in a thermally activated apparent resistivity. As a result the standard transport measurements in BSCCO do not probe the dynamics of vortices in the bulk, but rather measure surface barrier properties.

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