Electron-doped superconductor La2−xCexCuO4: Preparation of thin films and modified doping range for superconductivity
A. Sawa, M. Kawasaki, H. Takagi, Y. Tokura
DOI 10.1103/PhysRevB.66.014531 · Physical Review B
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Abstract
We have investigated transport properties and a related electronic phase diagram of electron-doped La2−xCexCuO4 (LCCO) thin films prepared by pulsed laser deposition. Using BaTiO3 as a buffer layer, we could successfully extend the lower Ce composition limit for synthesis of a single-phase LCCO film down to x=0.06. Superconductivity in LCCO was found to occur within a Ce composition range 0.08<~x<~0.15. The superconducting composition range is apparently shifted toward the lower Ce doping side, as compared with other electron-doped cuprate superconductors, such as Nd2−xCexCuO4 (NCCO). In accord with this, the variations of the resistivity and the Hall effect as a function of Ce content x, are much larger than those of NCCO, tracking the shift of superconducting phase. Indeed, the transport properties of the LCCO films with the shifted optimum composition x=0.11 was found to be equivalent to those of the optimum NCCO (x=0.15). We discuss that this unusual phase diagram of LCCO originates from the reduction of the antiferromagnetic interaction as well as of the electron correlation strength.
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. | 27 | Pressure not reported | onset |
| La2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | zero_resistance |
| La2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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