Where does the transport current flow in Bi2Sr2CaCu2O8 crystals?
Dan T. Fuchs (1), Eli Zeldov (1), Michael Rappaport (1), Tsuyoshi, Tamegai (2), Shuuichi Ooi (2), Hadas Shtrikman(1) ((1) Weizmann Institute of, Science, (2) Tokyo University)
TL;DR
This paper introduces a new magnetic measurement technique to map current flow in BSCCO crystals, revealing that surface barriers significantly influence vortex dynamics and resistivity measurements.
Contribution
A novel method for visualizing current distribution in crystals, distinguishing between bulk pinning, surface barriers, and uniform flow, with insights into vortex behavior in BSCCO.
Findings
Surface barriers dominate vortex liquid phase in BSCCO.
Standard transport measurements mainly reflect surface barrier effects.
Most vortex liquid behavior is influenced by surface phenomena.
Abstract
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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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Magnetic properties of thin films · Medieval European Literature and History