Hole doping in Pb-free and Pb-substituted (Bi,Pb)2Sr2Ca2Cu3O10+δ superconductors
M. Karppinen, S. Lee, J. M. Lee, J. Poulsen, T. Nomura, S. Tajima, J. M. Chen, R. S. Liu, H. Yamauchi
DOI 10.1103/PhysRevB.68.054502 · Physical Review B
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Abstract
Using single-phase samples of the (Bi,Pb)2Sr2Ca2Cu3O10+δ [(Bi,Pb)-2223] high-Tc superconductor and utilizing two complementary analysis techniques, i.e., coulometric redox titration and x-ray-absorption near-edge structure spectroscopy at both O K and Cu L edges, the individual charges of the (Bi,Pb)2O2+δ charge reservoir and the superconductive block that contains the three CuO2 planes are consistently determined. Lead is found to enter the (Bi,Pb)-2223 phase with a valence close to III on average. As the oxygen content concomitantly decreases, the average CuO2-plane hole concentration decreases upon substituting bismuth in the pristine Bi-2223 phase with lead.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 108 | Pressure not reported | onset |
| (Bi0.85Pb0.15)2Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 108 | Pressure not reported | onset |
| (Bi0.89Pb0.11)2Sr1.86Ca2.02Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 109 | Pressure not reported | onset |
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