Electron-energy-loss spectra of the high-Tc superconductors Y-Ba-Cu-O and La-Sr-Cu-O
M. G. Ramsey, F. P. Netzer, J. A. D. Matthew
DOI 10.1103/PhysRevB.39.732 · Physical Review B
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Abstract
Electronic excitations of Y-Ba-Cu-O in superconducting and nonsuperconducting form and of La-Sr-Cu-O have been investigated by electron-energy-loss spectroscopy (EELS) in the valence and shallow core region, both in dNdE and N(E) form. The importance of quasiatomic resonances in the loss region 15 eV≤ΔE≤50 eV are emphasized, while the differences observed between superconducting and nonsuperconducting Y-Ba-Cu-O are ascribed to differences in the Cu-O stoichiometry. The temperature-induced decomposition of Y-Ba-Cu-O leads to a BaO-type surface layer; EELS from this layer corroborates the present loss assignments. The influence of electron-beam irradiation of La-Sr-Cu-O is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sro.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | onset |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
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