Evidence for peroxide formation in superconducting YBa2−xLaxCu3O7±δ
A. Manthiram, X. X. Tang, J. B. Goodenough
DOI 10.1103/PhysRevB.37.3734 · Physical Review B
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Abstract
The sysetm YBa2−xLaxCu3O7±δ(0≤x≤0.5), annealed to a maximum oxygen concentration under 1 atm of O2, exhibits three distinct compositional ranges. (1) For 0≤x<0.05, the maximum oxygen concentration is O6.94+0.5x; the intercalated oxygen atoms are monomeric and Tc increases to 99 K at x=0.05. (2) For 0.10≤x<0.5, the maximum oxygen concentration is O6.85+0.5x; beyond x≊0.07 the additional oxygen appear to be intercalated as peroxide ions and Tc decreases linearly with x through a smooth orthorhombic-tetragonal phase transition at x=0.30. (3) For 0.05≤x<0.10, a transition between the two regimes occurs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 97 | Pressure unresolved | midpoint |
| YBa1.975La0.025Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 99 | Pressure unresolved | midpoint |
| YBa1.95La0.05Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 99 | Pressure unresolved | midpoint |
| YBa1.925La0.075Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 99 | Pressure unresolved | midpoint |
| YBa1.9La0.1Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure unresolved | midpoint |
| YBa1.8La0.2Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure unresolved | midpoint |
| YBa1.7La0.3Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 67 | Pressure unresolved | midpoint |
| YBa1.6La0.4Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52 | Pressure unresolved | midpoint |
| YBa1.5La0.5Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure unresolved | midpoint |
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