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- W2953088045 abstract "High quality, c-axis oriented thin films of semiconducting La2CuO4 have been fabricated by pulsed laser-ablation deposition. Superconducting properties have been successfully induced in the films by a postdeposition, ex-situ static annealing process in a F2/N2 gas mixture. The influence of the fluorination temperature on the structural, magnetic, and electronic properties of the resulting thin films has been examined in detail. X-ray data reveal that facile fluorination of the films proceeds via a complex, multistage process, often yielding two distinct La2CuO4-type phases. This phase segregation suggests a disproportionation process following fluorine uptake. Such a disproportionation is subtly different from that found for oxygen excess La2CuO4 in that for La2CuO4+δ the parent O4 and an oxygen rich (O4+δ) phase are formed, but in the present system two fluorinated (i.e., oxidized) phases are formed. La2CuO4 thin films fluorinated at a temperature of 150 °C possess the highest values for both Tc (onset) (ca. 38.5 K) and critical current density (>106 A cm-2 at 4.2 K in zero magnetic field). Magnetic susceptibility data demonstrate that this fluorination methodology is of sufficient sensitivity to allow the controlled hole-doping of semiconducting La2CuO4 thin films through to the high-temperature superconducting regime." @default.
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- W2953088045 date "1998-09-24" @default.
- W2953088045 modified "2023-10-17" @default.
- W2953088045 title "Synthesis, Structure, and Magnetic Characterization of Pulsed Laser-Ablated Superconducting La<sub>2</sub>CuO<sub>4</sub>F<i><sub>x</sub></i> Thin Films" @default.
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- W2953088045 doi "https://doi.org/10.1021/cm9802752" @default.
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