100-K superconducting phases in the Tl-Ca-Ba-Cu-O system
R. M. Hazen, L. W. Finger, R. J. Angel, C. T. Prewitt, N. L. Ross, C. G. Hadidiacos, P. J. Heaney, D. R. Veblen, Z. Z. Sheng, A. El Ali, A. M. Hermann
DOI 10.1103/PhysRevLett.60.1657 · Physical Review Letters
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Abstract
Two superconducting phases, Tl2Ca2Ba2Cu3O10+δ (2223) and Tl2Ca1Ba2Cu2)8+δ (2122), both with onset Tc near 120 K and zero resistivity at 100 K, have been isolated from samples in the Tl-Ca-Ba-Cu-O system. The new 2223 superconductor has a 5.40×5.40×36.25-Å3 pseudotetragonal unit cell. The 2122 superconductor, which appears to be structurally related to Bi2CaSr2Cu2O8+δ, has a 5.44×5.44×29.55-Å3 pseudotetragonal subcell. The 2223 phase is probably related to 2122 by the addition of extra calcium and copper layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ca2Ba2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | onset |
| Tl2Ca2Ba2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | zero_resistance |
| Tl2Ca1Ba2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | onset |
| Tl2Ca1Ba2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | zero_resistance |
| Bi2CaSr2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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