Polytypoid structure of Pb-modified Bi-Ca-Sr-Cu-O superconductor
R. Ramesh, G. Thomas, S. Green, C. Jiang, Yu Mei, M. L. Rudee, H. L. Luo
DOI 10.1103/PhysRevB.38.7070 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Pb addition has been found to improve the superconducting properties of a Bi-Ca-Sr-Cu-O superconductor. We report zero resistance at 104 K in a Bi1.4Pb0.6Ca2Sr2Cu3Oy alloy with no steps in the resistivity. Pb replaces Bi in the unit cell, as determined by x-ray microanalysis. The superconducting phase has the same structure as the alloy without lead, with the c parameter uniformly 38.2 Å. The Cu+Ca content of these regions has also been found to be higher than in the undoped sample, indicating that the periodicity is determined by the composition leading to polytypoids. Such polytypoid structures appear to correlate well with the critical temperatures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.4Pb0.6Sr2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 104 | Pressure not reported | zero_resistance |
| Bi1.4Pb0.6Sr2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
| Bi2Sr2Ca2Cu4Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | zero_resistance |
Similar papers
Effect of superimposed electrical and thermal gradients in superconducting polycrystalline Bi-Pb-Sr-Ca-Cu-O
similarity 0.95Richard A. Doyle & Vladimir V. Gridin
Source status unknown — claims are unverified
Influence of lead on the formation of the 110-K superconducting phase in the Bi-Sr-Ca-Cu-O compounds
similarity 0.94E. Chavira et al.
Source status unknown — claims are unverified
Stability of superconducting phases in Bi-Sr-Ca-Cu-O and the role of Pb doping
similarity 0.94S. X. Dou et al.
Source status unknown — claims are unverified
Crystal substructure and physical properties of the superconducting phase Bi4(Sr,Ca)6Cu4O16+x
similarity 0.94J. M. Tarascon et al.
Source status unknown — claims are unverified
Properties and structure of the F-doped (Bi,Pb)-Sr-Ca-Cu-O superconductor
similarity 0.94Xiao-hui Gao et al.
Source status unknown — claims are unverified
Fluctuation conductivity and microscopic granularity in Bi-based high-temperature superconductors
similarity 0.93A. R. Jurelo et al.
Source status unknown — claims are unverified