Chemical composition and electronic structure of high-temperature superconductors: Ba2EuCu3O7−x and La2−xSrxCuO4
Ming Tang, Y. Chang, M. Onellion, J. Seuntjens, D. C. Larbalestier, G. Margaritondo, N. G. Stoffel, J. M. Tarascon
DOI 10.1103/PhysRevB.37.1611 · Physical Review B
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Abstract
We have studied the electronic structure of Ba2EuCu3O7−x and La2−xSrxCuO4 (x=0–0.15) with synchrotron-radiation photoemission and electron-energy-loss spectroscopy. The results were compared to those previously obtained on Ba2YCu3O7−x. The observed photoemission resonances are consistent with a prevailing Cu2+ valence state for copper. Partial-yield spectra of Ba2EuCu3O7−x indicate that the valence state of Eu is Eu3+, and that of Ba is Ba2+, similar to the corresponding elements in Ba2YCu3O7−x. From the energy-loss spectra, we derived plasmon energies and indications for peaks in the density of unoccupied states. The change in x for the La2−xSrxCuO4 samples only causes rigid shifts of the photoemission spectra.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2EuCu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba2YCu3O7-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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