Bulk transport properties of Bi2Sr2CaCu2O8 crystals in the Corbino disk geometry

Transport measurements have been made on Bi2Sr2CaCu2O8 single crystals in t he Corbino disk geometry where vortices should not cross the sample edges i n a fixed applied field. The results are compared directly with a strip geo metry by cutting the disk into a strip and remeasuring the sample using the same contacts. Pronounced differences are observed in both the resistive t ransition and the current-voltage characteristics in these two geometries. The critical current density in the vortex solid phase is at least 20 times smaller than usual estimates for a strip geometry. We conclude that the tr ansport properties of Bi2Sr2CaCu2O8 samples in the strip geometry are domin ated by surface barriers in both solid and liquid vortex phases over a wide range of fields and temperatures.