Properties and structure of the F-doped (Bi,Pb)-Sr-Ca-Cu-O superconductor
Xiao-hui Gao, Xiao-Gang Wang, Shu-fen Jiang, Jie Li, Sai Gao, Guo-dong Zheng
DOI 10.1103/PhysRevB.50.1237 · Physical Review B
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Abstract
Using transmission electron microscopy, x-ray photoelectron spectroscopy, infrared, positron annihilation, and differential specific-heat measurements, we have studied the properties and structure of the F-doped (Bi,Pb)-Sr-Ca-Cu-O superconductor. The results show that the fluorine atoms are homogeneously distributed in the superconducting phase and substituted for the oxygen atoms at O(2) crystallographic sites; the Pb-F and Cu-F bonds are formed. F-doping results in the variance of the incommensurate modulation structure, the increase of the point defects and chemical pressure, the enhancement of the flux-pinning effect, and the change of the electronic structure and chemical bond, and greatly improves the superconductive properties of the 2223 phase of (Bi,Pb)-Sr-Ca-Cu-O.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.65Pb0.35Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 108.6 | Pressure unresolved | zero_resistance |
| Bi1.65Pb0.35Sr2Ca2Cu2.6(CuF2)0.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 116.4 | Pressure unresolved | zero_resistance |
| Bi1.65Pb0.35Sr2Ca2Cu2.6(CuF2)0.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 117.2 | Pressure unresolved | onset |
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