Reaction of Rb and oxygen overlayers with single-crystalline Bi2Sr2CaCu2O8+δ superconductors
P. A. P. Lindberg, Z. -X. Shen, B. O. Wells, D. S. Dessau, D. B. Mitzi, I. Lindau, W. E. Spicer, A. Kapitulnik
DOI 10.1103/PhysRevB.39.2890 · Physical Review B
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Abstract
Single crystals of Bi2Sr2CaCu2O8+δ superconductors, in situ cleaved and modified by Rb and oxygen overlayers, have been studied using ultraviolet and x-ray photoemission spectroscopy. The core-level results show that Rb strongly reacts with the Bi and O states, while the Cu and Sr states are left unchanged. This observation strongly indicates that the Bi-O plane forms the surface layer. Subsequent exposure to oxygen results in new oxygen states at the surface as monitored by the O 1s core-level data. For both Rb and oxygen overlayers the valence-band spectra are severely altered. In particular, new valence-band states, presumably of oxygen character, are formed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
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