CeO2 compatibility with YBa2Cu3O7−δ in superconducting-film multilayers
Yu. A. Boikov, T. Claeson, D. Erts, F. Bridges, Z. Kvitky
DOI 10.1103/PhysRevB.56.11312 · Physical Review B
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Abstract
High-quality superconducting (Tc≈90K, jc>106A/cm2 at 77 K) epitaxial (001) YBa2Cu3O7−δ films were grown by laser ablation on (001) CeO2/(11̱02) Al2O3. An interaction between YBa2Cu3O7−δ and CeO2 would influence the structure and the superconducting parameters. A marked degradation of the superconducting transition temperature (Tc=74K) was observed when twenty 2-nm-thick CeO2 layers were inserted equidistantly into a (001) YBa2Cu3O7−δ film (200 nm). BaCeO3 crystalline inclusions were detected by x-ray diffraction. X-ray-absorption fine-structure investigations at the Cu-K edge indicate that Ce substitutes for Y in YBa2Cu3O7−δ. Near-edge x-ray-absorption studies indicate that the valence of Ce incorporated into the YBa2Cu3O7−δ regions of the multilayer structure is also +4.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74 | Pressure not reported | unknown |
| Y1.2CexBa2.1Cu3.1Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| Y1-xCexBa2Cu3O7 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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