Oxygen distribution, incommensurate modulation, and structural disorder in Bi{sub 2}Sr{sub 2}Ca{sub 1{minus}{ital y}}Y{sub {ital y}}Cu{sub 2}O{sub 8+{delta}} and Bi{sub 10}Sr{sub 15}Fe{sub 10}O{sub 46} single crystals
Journal Article
·
· Physical Review, B: Condensed Matter
- The New Zealand Institute for Industrial Research and Development, P.O. Box 31-310, Lower Hutt (New Zealand)
- Laboratoire de Physique des Solides Semi-cristallins, IGA, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne (Switzerland)
- Department of Superconductivity, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113 (Japan)
Electron diffraction and high-resolution electron microscopy along the {ital c} axis have been used to examine the local structural variations in modulated Bi{sub 2}Sr{sub 2}Ca{sub 1{minus}{ital y}}Y{sub {ital y}}Cu{sub 2}O{sub 8+{delta}} and Bi{sub 10}Sr{sub 15}Fe{sub 10}O{sub 46} single crystals in the as-prepared, underdoped, and overdoped state. In both materials the structural disorder, of which the structural modulation is one aspect, results from the labile nature of the BiO planes. A structural model for the BiO layers which explains the structural modulation and describes all the structural defects observed is suggested. A drastic change in the nature of the modulation due to an antiphase boundary structure appears in the highly substituted Y crystals in concomitance with the metal-insulator transition. The modified modulation contributes to the suppression of superconductivity by affecting the geometry of the CuO planes. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 399828
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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