YBa_2Cu_3O_（7－x）和GdBa_2Cu_3O_（7－x）薄膜中涡旋  

OBSERVATION OF VORTEX GLASS TRANSITION IN YBa_2Cu_3O_(7-x)AND GdBa_2Cu_3O_(7-x)FILMS

作　　者：王长安[1] 李宏成[1] 王瑞兰[1] 周为烈 王玉鹤[1] 苏清新[1] 冯国光[1] 李林[1] 李兵[1] 

机构地区：[1]中国科学院物理研究所超导国家实验室,中国科学院物理研究所,中国科学技术大学结构分析实验室,中国科学院北京电子显微镜实验室,中国科学院低温技术中心

出　　处：《低温物理学报》1995年第5期334-347,共14页Low Temperature Physical Letters

摘　　要：本文给出了具有高密度孪晶界ｃ取向ＹＢａ２Ｃｕ３Ｏ７－ｘ外延薄膜存在涡旋玻璃转变及很好的标度行为的实验证据．在有α方向晶粒或４５°晶界的ＧｄＢａ２Ｃｕ３Ｏ７－ｘ外延薄膜中存在涡旋玻璃转变但在转变温度附近观察到磁通蠕动和热激活磁通流动的某些特征．这些结果可以在涡旋玻璃理论，Ａｎｄｅｒｓｏｎ－Ｋｉｍ磁通蠕动模型以及热激活磁通流动模型框架内给于很好的解释．Abstract Strong experimental evidence for the existence of vortex glass transition and good scaling behavior in high quality epitaxially c-axis oriented YBa2Cu3O7-x film with dense twin boundaries in a certain range of field is given in this paper.In GdBa2Cu3O7-x films with a-axis oriented platelets or with 45°grain boundaries,the vortex glass transition was confirmed, but some characteristics of flux creep and thermally activated flux flow are observed near vortex glass transition temperature Tg.These results could be explained quite well in the framework of vortex glass theory,Anderson-Kim flux creep model and thermally activated flux flow model,respectively.

关 键 词：YBCO GBCO 超导材料 薄膜 涡旋玻璃转变 

分 类 号：TM263[一般工业技术—材料科学与工程] O511.1[电气工程—电工理论与新技术]