X-ray-absorption studies of the high-Tc superconductors La1.8Sr0.2CuO4 and La1.8Ba0.2CuO4
J. B. Boyce, F. Bridges, T. Claeson, T. H. Geballe, C. W. Chu, J. M. Tarascon
DOI 10.1103/PhysRevB.35.7203 · Physical Review B
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Abstract
X-ray absorption studies of La1.8Sr0.2CuO4 and La1.8Ba0.2CuO4 indicate that no structural transition that alters the valence or the near-neighbor environment by >0.01 Å occurs between 4 and 300 K. The doping with Sr and Ba primarily changes the Cu-O distance and width along the c axis. The larger width of the superconducting transition region observed in the Ba-doped material may result from its larger static disorder. Estimates of the Cu-O vibrational frequencies suggest that a phonon-coupling mechanism is just compatible with the observed Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.8Sr0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | midpoint |
| La1.8Ba0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | onset |
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