Electronic effect of lead substitution in single-crystal Bi(Pb)-Sr-Ca-Cu-O superconductors determined by scanning tunneling microscopy
Zhe Zhang, Yue Li Wang, Xian Liang Wu, Jin-Lin Huang, Charles M. Lieber
DOI 10.1103/PhysRevB.42.1082 · Physical Review B
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Abstract
Scanning tunneling microscopy has been used to characterize directly the surface electronic structure of a series of single-crystal PbxBi2−xSr2CaCu2O8 superconductors. High-resolution spectroscopic measurements show that within ±0.5 eV of the Fermi level the Bi(Pb)-O electronic structure is independent of the Pb concentration (x≤0.7). Extended spectroscopic measurements demonstrate that the density of unfilled states at +1 eV systematically decrease as the concentration of Pb increases, although the filled states between 0 and -2 eV are essentially independent of the concentration of Pb. In addition, analysis of the differential conductivity indicates that the surface conductivity varies from weakly metallic to semiconducting as the tip-surface separation increases.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure unresolved | zero_resistance |
| Pb0.3Bi1.7Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure unresolved | zero_resistance |
| Pb0.7Bi1.3Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure unresolved | zero_resistance |
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