Josephson characteristics in a-axis oriented YBa2Cu3O7−δ/PrBa2Cu3O7−δ′/YBa2Cu3O7−δ junctions

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Abstract
A sandwich‐type all‐oxide Josephson junction consisting of an a‐axis oriented YBa2Cu3O7−δ/PrBa2Cu3O7−δ’/YBa2Cu3O7−δ structure has been realized and its Josephson characteristics experimentally investigated. Almost all the fabricated junctions showed the Josephson characteristics, including a resistively shunted junction (RSJ)‐like current‐voltage characteristic and a Fraunhofer‐like magnetic‐field dependence of the critical current. The obtained maximum values of the critical‐current density jc and the IcRn value were 110 A/cm2 and 80 μV, respectively, for a 50‐nm‐thick PBCO interlayer at 3 K. Besides, the temperature dependencies of the critical current and the normal resistance were measured. Ic was proportional to exp(− aT1/2), where a is a constant.