The form of the incommensurate shear distortions in the superconducting PbBiSrCaCuO compounds and their relation to T<sub>c</sub>
W M Stobbs; S B Newcomb; R E Dunin-Borkowski; S E Male; W M Stobbs; Dept. of Mater. Sci. & Metall., Cambridge Univ., UK; S B Newcomb; Dept. of Mater. Sci. & Metall., Cambridge Univ., UK; R E Dunin-Borkowski; Dept. of Mater. Sci. & Metall., Cambridge Univ., UK; S E Male; Dept. of Mater. Sci. & Metall., Cambridge Univ., UK
Журнал:
Superconductor Science and Technology
Дата:
1990-08-01
Аннотация:
The authors have examined the structure of the Pb-containing variants both of the Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+ delta </sub> (2212) and of the Bi<sub>2</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10+ delta </sub> (2223) high-T<sub>c</sub> oxide superconductors, using TEM, and describe here the way in which there can be differences in the character of the various incommensurate distortions found in these materials. It is further demonstrated that, in at least one compound in this family, the form of the distortion structure can be changed by an anneal from being predominantly of shear wave character to being mainly compositional in nature, and that this is associated with a change in the superconducting characteristics.
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