Copper MII,III x-ray-emission spectra of copper oxides and the bismuth cuprate superconductor
D. R. Mueller, J. Wallace, D. L. Ederer, J. J. Jia, W. L. O’Brien, Q. Y. Dong, T. A. Callcott
DOI 10.1103/PhysRevB.46.11069 · Physical Review B
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Abstract
Photon-excited soft x-ray emission spectra for CuO, Cu2O, and bismuth cuprate in the region of the Cu 3d→3p transitions were measured to obtain bulk-sensitive electronic partial density-of-states information. For CuO and Cu2O transitions from the valence levels into the MII and MIII levels were clearly resolved. The emission features were separated by the 2.3-eV spin-orbit interaction of the copper 3p1/2 and 3p3/2 states and appeared in the statistical intensity ratio. The copper MIII emission spectrum of the superconductor is broader than the spectra of CuO and Cu2O. For all three compounds the shape of the MIII emission spectrum extracted from the data is qualitatively similar to calculations of the copper single-particle local density of states. No evidence of multiplet structure was observed in the emission spectrum of CuO in spite of the open d shell in the ground state. The measurements are compared with published copper L emission data and photoemission results.
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. | 80 | Pressure not reported | unknown |
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