JOSEPHSON EFFECTS IN Nb/YBa_(2)Cu_(3)O_(7-δ) POINT CONTACTS AND YBa_(2)Cu_(3)O_(7-δ) BREAK JUNCTIONS

作     者：ZHAO Shiping TAO Hongjie CHEN Yingfei YANG Qiansheng LIAO Qide A Shao XU Xiaozhen 赵士平;陶宏杰;陈莺飞;杨乾声;廖启德;阿莎;除孝贞

作者机构：Institute of PhysicsAcademia SinicaBeijing Department of PhysicsCentral In stitute of NationalitiesBeijing 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：1988年第5卷第6期

页      面：249-252页

学科分类：080705[工学-制冷及低温工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0807[工学-动力工程及工程热物理] 0702[理学-物理学] 

主　　题：temperature behavior steps 

摘      要：Josephson effects have been observed in Nb/YBa_(2)Cu_(3)O_(7-δ) point contacts and YBa_(2)Cu_(3)O_(7-δ) break *** the junctions are exposed to a microwave field,the I-V characteristics show constant voltage steps,the heights of which follow the Bessel function *** asymmetry about zero bias has been observed in YBCO break junctions which,we suggest,may possibly result from flux trapping in the complicated weak link structure of the ***-induced sub-steps have also been found in YBCO break *** experiments were conducted at liquid helium temperature.