高温超导GdBa_2Cu_3O_(7-δ)薄膜双晶晶界结特性研究  

BICRYSTAL GRAIN BOUNDARY JUNCTIONS PROPERTY IN HIGH T c SUPERCONDUCTING GdBa 2Cu 3O 7-δ THIN FILMS

作　　者：姚久胜[1,2] 樊江水[1,2] 王瑞兰[1,2] 万发宝 李宏成[1,2] 

机构地区：[1]中国科学院物理研究所国家超导实验室 [2]西北大学物理系

出　　处：《光子学报》1998年第3期223-227,共5页Acta Photonica Sinica

摘　　要：在晶界夹角为２４°的ＹＳＺ人工双晶基片上，采用原位直流磁控溅射法制备了高温超导双晶ＧｄＢａ２Ｃｕ３Ｏ７－δ超导薄膜．采用光刻技术在晶界上刻出了尺寸５×５μｍ２的双晶晶界结．在７７Ｋ下观测了结的直流Ｉ－Ｖ特性和在１０ＧＨｚ微波辐射下结的Ｓｈａｐｉｒｏ台阶．这表明我们的人工双晶晶界结具有约瑟夫森弱连接行为．对结的特性进行了初步的理论分析和在实验基础上的数值模拟，模拟结果与ＲＳＪ理论符合较好，表明我们的双晶晶界结基本符合ＲＳＪ模型．The high T c GdBa 2Cu 3O 7-δ thin films have been grown on yttria stabilized zirconia (YSZ) artificial bicrystal substrates with misorientation of 24° by in situ dc magnetron sputtering deposition method.Grain boundary junctions were fabricated by the ordinary photolithography.The junctions were located just at the grain boundary of the substrate.The sizes of the junction is 5×5μm 2.The I V characteristics and the Shapiro steps were measured under direct current and with 10GHz microwave irradiation,respectively.This measurement suggests that the bicrystal grain boundary junctions have Josephson weak link behaviour.On the base of experiment,the rudimentary theoretical analysis and the numerical fitting are performed.The fitting result indicates that the bicrystal grain junctions are close to the prediction of the resistively shunted junction(RSJ)type.

关 键 词：高温超导体 双晶晶界结 GBCO I-V特性 薄膜 

分 类 号：TM262.014[一般工业技术—材料科学与工程]