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High-Resolution Electron Microscopy and Electron Diffraction Study of an Incommensurate Bi 1.8 Sr 1.5 Ca 1.5 Cu 2.2 O x Superconductor

1989; Institute of Physics; Volume: 28; Issue: 10A Linguagem: Inglês

10.1143/jjap.28.l1775

1347-4065

Takashi Onozuka, Tsuyoshi Kajitani, Makoto Hirabayashi, Hiroshi Sato, Terence E. Mitchell,

Iron-based superconductors research

Weak contrast modulations with a long period of about 15 nm along [010] are observed in high-resolution lattice images of a Bi 1.8 Sr 1.5 Ca 1.5 Cu 2.2 O x superconductor. Contrast modulations with short periods, 4.5 b o /2 (1.2 nm) and 5 b o /2 (1.3 nm), along [010] are reproduced with a multislice computer simulation. Those contrast modulations as well as the intensities of incommensurate superlattice reflections are interpreted by a long period superlattice structure model consisting of alternative alignments of domains with the periods of 4.5 b o and 5 b o along [010].