Distribution of Oxygen Atoms in a YBa_2Cu_3O_<6.4> Superconductor Visualized by Ultra-High-Resolution Electron Microscopy
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Arrangements of oxygen atoms in a superconducting YBa_2Cu_3O_<6.4> crystal (T_c=27 K) have been visualized by ultra-high-resolution high-voltage electron microscopy. The crystal consists of major orthorhombic and minor pseudotetragonal regions. Oxygens in CuO_y planes do not distribute homogeneously but are mostly concentrated in areas smaller than 100 Å in diameter, in which clusters of 8 to 30 Å are closely packed with an oxygen arrangement similar to that in YBa_2Cu_3O_<6.4> or YBa_2Cu_3O_<7.7> respectively. The volume ratio of these two types of clusters varies in each area, resulting in the local change of the crystal symmetry. The formation of these oxygen-rich areas as well as clusters must strongly affect the mechanism and properties of superconductivity.
- 社団法人応用物理学会の論文
- 1992-09-15
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