Transport properties of BSCCO crystals with and without surface barriers

Abstract

Large BSCCO crystals with electrical contacts positioned far from the edges are studied by transport measurements, then cut into the common narrow strip geometry, and remeasured. Instead of showing larger resistance, the narrow strip samples display a dramatic drop in the resistance, enhanced activation energies, and nonlinear characteristics due to strong surface barriers. The surface barriers also dominate the resistive drop at the first-order phase transition. Because the surface barriers are avoided in large crystals, we are able to probe the solid phase and find good agreement with the recent predictions of Bragg glass theory.

4 pages, 5 figures, submitted to PRL

References in corpus (2)

• Possible new vortex matter phases in BSCCO
• Where does the transport current flow in Bi2Sr2CaCu2O8 crystals?

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