Comment on "Identification of a superoxide in superconducting La2CuO4+δ by x-ray photoelectron spectroscopy"
Jianshi Zhou, Sanjai Sinha, J. B. Goodenough
DOI 10.1103/PhysRevB.39.12331 · Physical Review B
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Abstract
"Tetragonal," superconductive La2CuO4+δ has been synthesized at 800°C and 23 kbar under a high oxygen pressure. A first-order phase change to the orthorhombic, antiferromagnetic state occurs with the loss of bulk oxygen; a continuous loss of superficial oxygen occurs through the transition. These data make it unnecessary to postulate the presence of interstitial bulk superoxide and indicate that any superoxide identified by x-ray photoelectron spectroscopy is probably associated with superficial oxygen, not the bulk oxygen responsible for superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | zero_resistance |
| Ba2YCu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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