【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YBa₂Cu₃O₇超导体和射频溅射制备的单晶外延YBa₂Cu₃O₇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Y₂BaCuO₅（211）第二相粒子周围。更多还原

【Abstract】 With KYKY-1000B SEM, the distributions of magnetic flux on the surface of high J_c superconductorshave 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）YBa₂ Cu₃ O₇ Superconductors and epitaxial thin YB_a2 C_u3 O₇ 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 （Y₂Bz Cu O₅.）更多还原