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• W2019548902 abstract "A preliminary phase diagram is given for the system La2CuO4+δ, o ≤ δ ≤ 0.09, prepared electrochemically at room temperature. Room-temperature X-ray data distinguish two orthorhombic phase fields, OI for δ < 0.055 and OM for δ > 0.055. The orthorhombicity of OI decreases with increasing δ, that of OM increases with δ. A spinodal phase segregation into an oxygen-rich superconductive phase and an oxygen-poor antiferromagnetic phase occurs in the temperature interval 220K < T ≤ Tsp; below 220 K, the mobility of the interstitial oxygen becomes too low for a further static phase segregation. The phase segregation causes an increase in resistivity and a decrease in the Seebeck coefficient with decreasing temperature in the interval 220 < T < Tsp. A similar transport behavior occurs in the range Tc < T < Tϱ ≤ 120 K in samples 0.02 ≤ δ ≤ 0.04; from comparisons with the La2−xSrxCuO4 system, we suggest that at lower temperatures this behavior is the signature for a further dynamic hole segregation, induced by atomic displacements, into domains more rich in mobile holes within the superconductive phase. The diamagnetic AC susceptibility associated with this superconductivity is independent of the magnetic field below 0.01 mT. In the compositional range 0.06 ≤ δ ≤ 0.09, the Seebeck data indicate a nearly constant concentration of itinerant holes in the superconductive CuO2 planes. We conclude that in the OM phase oxygen-oxygen interactions within the superconductive layers trap out at oxygen-atom clusters the excess mobile holes ΔP = 2δ−0.12 from the CuO2 planes. An Hc1 = 64 mT was obtained for δ = 0.09. A step in the resistivity drop at Tc signals a temperature interval Tc < T < Ton within which the superconductive pairs are confined to small domains. Whether these domains represent a second superconductive phase correlated to additional oxygen ordering that fails to develop with increasing δ or should be considered a pair-fluctuation phenomenon is not resolved." @default.
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• W2019548902 date "1992-11-01" @default.
• W2019548902 modified "2023-09-30" @default.
• W2019548902 title "Transport and magnetic properties of the superconducting La2CuO4+δ phases (0 < δ < 0.09) prepared by electrochemical oxidation" @default.
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• W2019548902 doi "https://doi.org/10.1016/0921-4534(92)90163-7" @default.
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