Modulation-free bismuth-lead cuprate superconductors: BiPbSr1+xL1−xCuO6 and BiPbSr2Y1−xCaxCu2O8
V. Manivannan, J. Gopalakrishnan, C. N. R. Rao
DOI 10.1103/PhysRevB.43.8686 · Physical Review B
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Abstract
Modulation-free BiPbSrLCuO6 (L=La, Pr, Nd) and BiPbSr2YCu2O8, which are isotypic with the n=1 and 2 members of the Bi2Sr2Can−1CunO2n+4 family, have been prepared and characterized. These parent compounds are nonsuperconducting, but when doped with holes by substitution chemistry give modulation-free superconducting cuprates of the general formulas BiPbSr1+xL1−xCuO6 and BiPbSr2Y1−xCaxCu2O8, exhibiting maximum Tc’s of 24 and 85 K, respectively. Significantly, the hole concentration at the maximum Tc is 0.12 in the cuprate family with a single Cu-O layer and 0.22 in that with two Cu-O layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BiPbSr1+xLa1-xCuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | unknown |
| BiPbSr1+xPr1-xCuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
| BiPbSr2Y1-xCaxCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
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