title: High-resolution electron microscopy study on crystal structures of high-Tc superconductors.
abstract: Recent studies of high-resolution electron microscopy on the high-Tc superconductors of Y-Ba-Cu-O and Bi-Ca-Sr-Cu-O are presented. The observed images of crystals thinner than 3 nm, taken under conditions that approached the Scherzer defocus condition, directly show the arrangements of cations and oxygen-vacant positions. The results reveal structural characteristics of the atomic scale; this offers important insights into the origin of the high-Tc superconductivity. The usefulness of high-resolution electron microscopy for studying complicated crystal structures is demonstrated for the high-Tc oxides.
authors: Institute for Materials Research, Tohoku University, Sendai, Japan.
authors: K
authors: K
authors: Hiraga
authors: T
authors: T
authors: Oku
authors: D
authors: D
authors: Shindo
authors: M
authors: M
authors: Hirabayashi
mesh_terms: D001729:Bismuth / Q000032:analysis*; D002118:Calcium / Q000032:analysis; D055598:Chemical Phenomena; D002621:Chemistry; D003300:Copper / Q000032:analysis; D003460:Crystallization; D004553:Electric Conductivity; D008854:Microscopy, Electron / Q000379:methods*; D015394:Molecular Structure; D010100:Oxygen / Q000032:analysis; D013324:Strontium / Q000032:analysis; D015018:Ytterbium / Q000032:analysis*
chemical_list: D003300:Copper; D015018:Ytterbium; D010100:Oxygen; D002118:Calcium; D001729:Bismuth; D013324:Strontium