Initial stages of degradation of superconductor surfaces: O2, H2O, CO2, and CO chemisorption on La2−xSrxCuO4
Richard L. Kurtz, Roger Stockbauer, Theodore E. Madey, Donald Mueller, Arnold Shih, Louis Toth
DOI 10.1103/PhysRevB.37.7936 · Physical Review B
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Abstract
The initial stages of degradation of high-Tc superconductor surfaces by interaction with atmospheric gases have been studied using ultraviolet photoelectron spectroscopy. O2 has little effect, while H2O adsorbs dissociatively with an initial sticking coefficient S0∼1, and form a surface hydroxide. CO2 adsorbs forming a carbonatelike surface species with an initial sticking coefficient of ∼0.3. CO is observed to result in similar adsorbed surface species with a much lower sticking coefficient of ∼3×10−4.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.8Sr0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-x 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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