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The Contact Resistance in the Pressed Powder of YBa2Cu3O7-δ

The apparent electrical resistivity of YBa2Cu3O7-δ powder just pressed into a pellet was measured in order to study the contribution of the grain boundary. The resistivity was found to behave as ρ=A exp [-BT]; (A, B>0) over a wide temperature range, even below the superconducting transition temperature, Tc, where each grain is superconducting. The result suggests the existence of a large potential barrier at the grain boundary.