Phonon-drag thermopower correlations to Tc in superconducting SrxNd1−xCuO2−δ: Evidence for phonon-mediated pairing in the high-Tc parent compounds
Edwin C. Jones, David P. Norton, Brian C. Sales, Douglas H. Lowndes, Ron Feenstra
DOI 10.1103/PhysRevB.52.R743 · Physical Review B
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Abstract
The ACuO2 compounds—containing only CuO2 planes separated by A ions—are the basic ‘‘building blocks’’ of the more complex high-Tc superconductors. Trivalently doped SrxNd1−xCuO2−δ thin films are shown to superconduct with the appearance of a phonon-drag contribution to the thermopower at the superconducting doping threshold. A monotonic increase in this phonon-drag contribution with Tc suggests that electron-phonon interactions play an important role in the pairing mechanism. A correlation between the deduced BCS coupling constants and Tc is consistent with strong-coupling theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr0.9Nd0.1CuO2-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21.5 | Pressure not reported | midpoint |
| SrxNd1-xCuO2-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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