Josephson characteristics inahyphen;axis oriented YBa2Cu3O7minus;dgr;/PrBa2Cu3O7minus;dgr;rsquo;/YBa2Cu3O7minus;dgr;junctions

摘要

A sandwichhyphen;type allhyphen;oxide Josephson junction consisting of anahyphen;axis oriented YBa2Cu3O7minus;dgr;/PrBa2Cu3O7minus;dgr;rsquo;/YBa2Cu3O7minus;dgr;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)hyphen;like currenthyphen;voltage characteristic and a Fraunhoferhyphen;like magnetichyphen;field dependence of the critical current. The obtained maximum values of the criticalhyphen;current densityjcand theIcRnvalue were 110 A/cm2and 80 mgr;V, respectively, for a 50hyphen;nmhyphen;thick PBCO interlayer at 3 K. Besides, the temperature dependencies of the critical current and the normal resistance were measured.Icwas proportional to exp(minus;aT1/2), whereais a constant.