Superconductivity phase diagrams for the electron-doped cuprates R2−xCexCuO4 (R=La, Pr, Nd, Sm, and Eu)
Y. Krockenberger, J. Kurian, A. Winkler, A. Tsukada, M. Naito, L. Alff
DOI 10.1103/PhysRevB.77.060505 · Physical Review B
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Abstract
The superconductivity phase diagrams of electron-doped cuprates of the form R2−xCexCuO4 (with R=La, Pr, Nd, Sm, and Eu) have been determined for cerium compositions 0<x<0.36 in a consistent series of epitaxial thin films grown by reactive molecular beam epitaxy. The use of epitaxial thin films allows the growth of materials away from thermodynamical equilibrium expanding the accessible phase space beyond the availability of bulk material. The superconducting phase space systematically increases with the rare-earth ionic size. The doping concentration where the maximal transition temperature occurs in La2−xCexCuO4 is considerably shifted to lower doping (x∼0.09) compared to La2−xSrxCuO4 (x∼0.15). At the same time, the width of the superconducting region is broadened.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
| Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | onset |
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | onset |
| Sm2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | Pressure not reported | onset |
| Eu2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| La2-xSrxCuO4 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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