Bulk superconducting Y2Ba4Cu7O15−δ and YBa2Cu4O8 prepared in oxygen at 1 atm
D. M. Pooke, R. G. Buckley, M. R. Presland, J. L. Tallon
DOI 10.1103/PhysRevB.41.6616 · Physical Review B
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Abstract
Synthesis of bulk Y2Ba4Cu7O15−δ and YBa2Cu4O8 high-Tc superconductors at atmospheric pressure, without the addition of alkali rate enhancers, is reported. The superconducting transition temperature for Y2Ba4Cu7O15−δ is shown to depend on oxygen stoichiometry, with the resistive onset observed above 90 K. The YBa2Cu4O8 phase has zero resistance Tc close to 80 K. A modified Y-Ba-Cu-O P-T phase diagram is presented.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | onset |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure unresolved | zero_resistance |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure unresolved | zero_resistance |
| Er2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure unresolved | zero_resistance |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | unknown |
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