Thermopower of YBa2Cu3O7 and related superconducting oxides
H. J. Trodahl, A. Mawdsley
DOI 10.1103/PhysRevB.36.8881 · Physical Review B
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Abstract
There is some disagreement in the literature concerning both the measured magnitude and the interpretation of the thermoelectric power of YBa2Cu3O7. We report a series of measurements that have guided us to a satisfactory explanation of both our own results and those reported by other groups. Most important is that we have explained the surprising precursor peak just above Tc as resulting from an enhanced phonon mean-free path in the presence of superconducting fluctuations. We develop a model that permits us to separately estimate the values of the diffusion and phonon-drag contributions to the thermopower. At 100 K the diffusion component is estimated to be -14 μV/K, a large negative value that suggests conduction by a narrow electron band. The phonon-drag thermopower is positive with a magnitude that depends on crystallite grain size.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | onset |
| GdBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | onset |
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