Extended x-ray-absorption fine-structure study of La2−xSrxCuO4−y superconductors
J. M. Tranquada, S. M. Heald, A. R. Moodenbaugh
DOI 10.1103/PhysRevB.36.8401 · Physical Review B
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Abstract
From measurements of extended x-ray-absorption fine structure at the Cu K edge between 10 and 300 K, we have determined the temperature dependence of the mean-square relative displacements σ2 for Cu-O, Cu-La, and Cu-Cu near neighbors in La2−xSrxCuO4−y with x=0, 0.15, and 0.3. It is found that σ2 for Cu-O and Cu-La neighbors shows little variation with x. Model calculations are used to demonstrate that σCu−O2 is sensitive to softening of the Cu-O breathing mode which has been predicted to be important for superconductivity in these materials. The Cu-O bonding is observed to be quite strong and no evidence is found for any significant change in the breathing-mode frequency with doping.
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. | — | Pressure not reported | unknown |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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