Thermoelectric power and resistivity measurements on oxygen-annealed HgBa2Ca2Cu3O8+δ superconductors
C. K. Subramaniam, M. Paranthaman, A. B. Kaiser
DOI 10.1103/PhysRevB.51.1330 · Physical Review B
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Abstract
The thermopower and resistivity of bulk superconducting HgBa2Ca2Cu3O8+δ (Hg-1223) have been measured for 15 samples (prepared from two batches) subjected to various annealing treatments in oxygen or nitrogen; all but two samples had values of zero-resistance Tc of approximately 134 K. In the normal state, the thermopower of the annealed samples shows a similar shape as a function of temperature: it decreases as temperature increases, with the rate of decrease slowing down at higher temperatures. The thermopower remains positive up to room temperature in all of our samples despite the high Tc values and annealing in oxygen, suggesting that the samples remain slightly underdoped.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | Pressure not reported | zero_resistance |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | Pressure not reported | onset |
| HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | unknown |
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