Experimental comparison of the effect that bulk pinning and surface barriers have on vortex motion in the vortex liquid state of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} single crystals
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne , Illinois 60435 (United States)
We perform electrical transport measurements in the mixed state of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} single crystals by using a Corbino disk geometry. In this configuration, vortices are forced to move in closed circular trajectories, without crossing the sample{close_quote}s edge. By comparison with conventional four-probe transport experiments we can contrast the role that bulk pinning and surface barriers have on vortex motion in the vortex liquid state of this material. Our Corbino and conventional experiments give the same temperature and field dependence for the electrical resistivity in the vortex liquid state, activation energies for vortex motion and irreversibility lines. Thus, we conclude that in these crystals, flux motion in the vortex liquid state is governed by bulk effects. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 664882
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 58, Issue 14; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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