Tunneling density of states in the lead-bismuth-oxide superconductors
F. Sharifi, A. Pargellis, R. C. Dynes
DOI 10.1103/PhysRevLett.67.509 · Physical Review Letters
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Abstract
We have performed an extensive set of tunneling measurements on the high-Tc perovskites BaPbO3,BaPb0.75Sb0.25O3, BaPb0.75Bi0.25O3, and Ba0.7K0.3BiO3. In these materials, the superconducting transition temperature varies from less than 1 to 30 K. Tunneling data show a linear background conductance similar to that observed in the cuprates and we have strong experimental evidence that this linear conductance results from intrinsic properties of the density of states in these materials. We also observe a remarkable correlation between Tc and the slope of this linear background conductance.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaPbO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure unresolved | onset |
| BaPb0.75Sb0.25O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure unresolved | unknown |
| BaPb0.75Bi0.25O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure unresolved | unknown |
| Ba0.7K0.3BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure unresolved | unknown |
| BaPbO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure unresolved | onset |
| BaPb0.75Sb0.25O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure unresolved | unknown |
| BaPb0.75Bi0.25O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure unresolved | unknown |
| Ba0.7K0.3BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure unresolved | unknown |
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