Pb substitution in the Bi2Sr2CaCu2O8+δ high-Tc superconductor: Cation overdoping
C. Kendziora, S. B. Qadri, E. Skelton
DOI 10.1103/PhysRevB.56.14717 · Physical Review B
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Abstract
We study the effects of Pb substitution in single crystals of the high-temperature superconductor Bi2Sr2CaCu2O8+δ. We compare Pb-substituted samples with “pure” (unsubstituted) crystals in terms of structure, cation composition, and the temperature dependences of ac susceptibility and Raman scattering. We find that Pb2+ primarily substitutes for Bi3+, leading directly to a Tc reduction characteristic of overdoped samples. We also observe structural changes related to the superlattice modulation along b*. Raman scattering studies indicate that some Pb atoms go to Sr sites. Low-temperature electronic Raman scattering shows further evidence for cation overdoping by comparison with oxygen annealed pure Bi2Sr2CaCu2O8+δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | unknown |
| Bi1.85Pb0.19Sr1.90Ca1.17Cu2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| Bi1.82Pb0.19Sr1.96Ca1.18Cu2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| Bi1.84Pb0.17Sr1.94Ca1.06Cu2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | unknown |
| Bi1.84Pb0.15Sr1.89Ca1.07Cu2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | unknown |
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