Oxygen deficiencies in the F-doped Bi2−xPbxSr2Ca2Cu3O10 superconductors studied by positron annihilation
Z. Tang, S. J. Wang, X. H. Gao
DOI 10.1103/PhysRevB.50.3209 · Physical Review B
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Abstract
Positron annihilation lifetime spectra were measured on F-doped Bi(Pb) 2:2:2:3 superconductors as a function of F content and analyzed by using a numerical Laplace inversion method. While the nominal fluorine content increases, it was clearly observed that (1) the average positron annihilation rate is decreased continuously, (2) the width of the positron-annihilation-rate distribution (ARD) is increased, (3) the region of the ARD becomes wider and exends down towards a lower annihilation rate. The increase in Tc with the increase in F content has a correlation with the changes of the ARD. Our positron results indicate that the F doping can produce a number of anion vacancies (or oxygen deficiency) and raise the concentration of Bi-O vacancy complexes in the Bi-O planes, which are substantiated by an anneal experiment in vacuum and responsible for the increases in Tc and Jc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.7Pb0.3Sr2Ca2Cu3OyF0.0 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 106.5 | Pressure unresolved | zero_resistance |
| Bi1.7Pb0.3Sr2Ca2Cu3OyF0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 111 | Pressure unresolved | zero_resistance |
| Bi1.7Pb0.3Sr2Ca2Cu3OyF0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 113.2 | Pressure unresolved | zero_resistance |
| Bi1.7Pb0.3Sr2Ca2Cu3OyF0.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 117.6 | Pressure unresolved | zero_resistance |
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