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A transmission electron microscope and group theoretical study of the new Bi-based high-Tc superconductors and some closely related Aurivillius phases

Withers, R.L. ; Thompson, J.G. ; Wallenberg, LR LU ; Fitz Gerald, J.D. ; Anderson, J.S. and Hyde, B.G. (1988) In Journal of Physics: Condensed Matter 21(36). p.6067-6083
Abstract
The Bi-based superconductors of approximate compositions Bi2Sr2CuO6 and Bi2Sr2CaCu2O8, and the closely related Aurivillius phases, Bi2BaNb2O9 and Bi4Ti3O12, are discussed from a group theoretical point of view. The structural complexities associated with these phases are treated in terms of successive modulation of an appropriately chosen parent structure. The space-group symmetries of the two Aurivillius phases and the average-structure space-group symmetries of the two superconductors are interpreted by such an approach. It is proposed that compositional ordering of the oxygens midway between adjacent Bi layers is responsible for the enlarged square root 2ap* square root 2ap average-structure basal-plane cell of the superconductors. In... (More)
The Bi-based superconductors of approximate compositions Bi2Sr2CuO6 and Bi2Sr2CaCu2O8, and the closely related Aurivillius phases, Bi2BaNb2O9 and Bi4Ti3O12, are discussed from a group theoretical point of view. The structural complexities associated with these phases are treated in terms of successive modulation of an appropriately chosen parent structure. The space-group symmetries of the two Aurivillius phases and the average-structure space-group symmetries of the two superconductors are interpreted by such an approach. It is proposed that compositional ordering of the oxygens midway between adjacent Bi layers is responsible for the enlarged square root 2ap* square root 2ap average-structure basal-plane cell of the superconductors. In the case of the incommensurate q= gamma a*+ delta c* modulation, the dimensional inflexibility of the CuO4 square-planar sheets is seen as the underlying structural case. (Less)
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publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics: Condensed Matter
volume
21
issue
36
pages
17 pages
publisher
IOP Publishing
external identifiers
  • scopus:0001109699
ISSN
0022-3719
DOI
10.1088/0022-3719/21/36/007
language
English
LU publication?
no
id
be8708a8-db72-4e23-b013-a5c3038add49
date added to LUP
2023-10-31 14:38:03
date last changed
2023-11-01 13:05:43
@article{be8708a8-db72-4e23-b013-a5c3038add49,
  abstract     = {{The Bi-based superconductors of approximate compositions Bi2Sr2CuO6 and Bi2Sr2CaCu2O8, and the closely related Aurivillius phases, Bi2BaNb2O9 and Bi4Ti3O12, are discussed from a group theoretical point of view. The structural complexities associated with these phases are treated in terms of successive modulation of an appropriately chosen parent structure. The space-group symmetries of the two Aurivillius phases and the average-structure space-group symmetries of the two superconductors are interpreted by such an approach. It is proposed that compositional ordering of the oxygens midway between adjacent Bi layers is responsible for the enlarged square root 2ap* square root 2ap average-structure basal-plane cell of the superconductors. In the case of the incommensurate q= gamma a*+ delta c* modulation, the dimensional inflexibility of the CuO4 square-planar sheets is seen as the underlying structural case.}},
  author       = {{Withers, R.L. and Thompson, J.G. and Wallenberg, LR and Fitz Gerald, J.D. and Anderson, J.S. and Hyde, B.G.}},
  issn         = {{0022-3719}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{36}},
  pages        = {{6067--6083}},
  publisher    = {{IOP Publishing}},
  series       = {{Journal of Physics: Condensed Matter}},
  title        = {{A transmission electron microscope and group theoretical study of the new Bi-based high-Tc superconductors and some closely related Aurivillius phases}},
  url          = {{http://dx.doi.org/10.1088/0022-3719/21/36/007}},
  doi          = {{10.1088/0022-3719/21/36/007}},
  volume       = {{21}},
  year         = {{1988}},
}