Photoemission study of a high-Tc superconducting Bi-Sr-Ca-Cu oxide
E. G. Michel, J. Alvarez, M. C. Asensio, R. Miranda, J. Ibáez, G. Peral, J. L. Vicent, F. García, E. Morán, M. A. Alario-Franco
DOI 10.1103/PhysRevB.38.5146 · Physical Review B
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Abstract
We have used ultraviolet, x-ray, and inverse-photoemission spectroscopies to characterize the electronic structure of a novel bismuth cuprate compound with an average composition Bi2.5Sr1.5Ca1Cu2Oy which becomes superconductor at 84 K. The data indicate that the valence band is shifted ∼2 eV to higher binding energy with respect to band-structure calculations. This together with the presence of shake-up satellites in the Cu 2p spectrum suggests that Udd is ∼6 eV for Cu 3d electrons in this Bi compound. The electron-electron correlation seems to be much smaller in the Bi-O planes than in the Cu-O planes. The chemical state of the cations is basically Cu2+, Bi3+, Ca2+, and Sr2+.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2.5Sr1.5Ca1Cu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | zero_resistance |
| Bi2.5Sr1.5Ca1Cu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
| Bi2.2Sr2Ca0.8Cu2O8+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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