高J_c超导材料磁通分布的电镜研究  

EM Study on Distribution of Magnetic Flux in High J_c Superconductors

作　　者：张存珪 张惠珍[1] 盖秀贞 童莉泰[2] 陈海英[2] 王桂芝[2] 

机构地区：[1]北京大学电镜室 [2]北京大学物理系

出　　处：《电子显微学报》1991年第3期255-259,共5页Journal of Chinese Electron Microscopy Society

摘　　要：在减压降温液氮温区(约64K),采用磁缀饰法(即高分辨Bitter图法),分别在熔融织构生长(MTG)的YBa_2Cu_3O_7超导体和射频溅射制备的单晶外延YBa_2Cu_3O_7薄膜上用KYKY-1000 B SEM观察到超导体的磁通分布图,属无序非晶态结构。在MTG超导体中得到清晰的孪晶界、层界和晶体缺陷对磁通的钉扎图象。最强的钉扎中心出现在尺寸较大的Y_2BaCuO_5(211)第二相粒子周围。With KYKY-1000B SEM, the distributions of magnetic flux on the surface of high J_c superconductors have been observed at liquid nitrogen temperature range (64K) by using the magnetic decoration method, i. e.high-resolution Bitter patternmethod. The samples are melt-textured growth (MTG)YBa_2 Cu_3 O_7 Superconductors and epitaxial thin YB_(a2) C_(u3) O_7 film by sputtering on Sr Ti O substrates. The results show that the twin boundaries, layer boundaries as well as crystal defects are pinning sites, and the strongest pinning appears in the vicinity of large grains of second phase (Y_2Bz Cu O_5.)

关 键 词：超导材料 磁通分布 电子显微镜 

分 类 号：TM260.145[一般工业技术—材料科学与工程]