X-ray-absorption near-edge-structure study of La2−x(Ba,Sr)xCuO4−y superconductors
J. M. Tranquada, S. M. Heald, A. R. Moodenbaugh
DOI 10.1103/PhysRevB.36.5263 · Physical Review B
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Abstract
Superconductors with the composition La2−x(Ba,Sr)xCuO4−y and x=0.0 to 0.3 have been studied through measurements of x-ray-absorption near-edge structure at the Cu K and La L edges. Contrary to recent band-structure calculations, we find that the Cu 3d electrons are localized with the copper ions having an integral 3d9 configuration (2+ valence) independent of dopant concentration. Variation in the area of the "white lines" at the La L2,3 edges with doping indicates that reduction of the valence charge results in an increase in unoccupied states (probably consisting of holes in the O 2p band) having d symmetry relative to the La site. These O 2p holes also appear to have d symmetry with respect to the Cu sites.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | onset |
| La2-xSrxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | onset |
| La2-xSrxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | onset |
| La2-xSrxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | onset |
| La2-xBaxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | onset |
| La2-xBaxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | onset |
| La2-xBaxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
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