Abstract
Measurements of the zero-field resistive transition of Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8] single crystals suggest that a bulk zero-resistance state develops through a sequential process characterized by two transition temperatures. The upper transition corresponds to Josephson coupling of parallel CuO bilayers, and the lower transition to the conventional Kosterlitz-Thouless dissociation of bound vortex excitations. Measurements using a flux transformer'' electrode geometry indicate a pronounced peak in the secondary voltage, which is suppressed by an external magnetic field.
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