Soft x-ray absorption and emission spectra and the electronic structure of the Ba2YCu3O7−x superconductor
K.-L. Tsang, C. H. Zhang, T. A. Callcott, L. R. Canfield, D. L. Ederer, J. E. Blendell, C. W. Clark, N. Wassdahl, J. E. Rubensson, G. Bray, N. Mortensson, J. Nordgren, R. Nyholm, S. Cramm
DOI 10.1103/PhysRevB.37.2293 · Physical Review B
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Abstract
We present e-beam-excited soft-x-ray emission spectra and total-photoelectron-yield spectra in the 20–600 eV photon energy range for Ba2YCu3O7−x. In soft x-ray emission, the N4,5 structure of Ba, the M4,5 spectrum of Y, and the K spectrum of O provide a direct measure of the p-type partial density of states (p-PDOS) localized on the respective atomic sites. In each case the p-PDOS is very small at the Fermi energy ɛF. The maximum in the O K spectrum is 2.6±0.5 eV below ɛF. This result provides direct confirmation that the shoulder previously found at ɛF-2.3 eV in photoelectron emission spectra is associated with O p orbitals. No changes are observed between spectra taken above and below Tc. .AE
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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