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• W1986278622 abstract "Two superconducting vanadomercury cuprates, Hg0.8V0.2Ba2CuO4+ δ and Hg0.8V0.2CaCu2O6 + δ ande been synthesized for the first time. The XRD and HREM study of these compounds show that they exhibit a very regular layer stacking characteristic of the 1201 and 1212 structures, respectively. Nevertheless, they differ from the pure mercury based cuprates, by a significant decrease of the c parameters: a = 3.8864(1) Å, c = 9.3387(3) Å for the sample with nominal composition Hg0.8V0.2Ba2 CuO4.3 and a = 3.8694(2) Å, c = 12.5003(7) Å for the sample with nominal composition Hg0.8V0.2Ba2CaCu2O6.3. The performances of these superconductors are similar to the pure mercury-based cuprates prepared under high pressure, in spite of their structural differences, showing that the presence of vanadium on the mercury sites does not affect superconductivity. Both as-synthesized oxides exhibit a narrow transition with a Tc midpoint of 90 K and 115 K, respectively, and a high superconducting volume fraction of 70% at 70 K. The study of the influence of oxygen non-stoichiometry upon superconductivity shows that the as-synthesized cuprate with nominal composition Hg0.8V0.2Ba2CaCu2O4.3 is only optimized, whereas the 1212 cuprate corresponding to the nominal composition Hg0.8V0.2Ba2CaCu2O6.3 can be optimized by oxygen annealing, leading to a Tc midpoint of 124 K. The magnetization measurements versus H, at various temperatures, show that their pinning properties are similar to those of the pure “BaHg” cuprates that exhibit the same critical temperatures." @default.
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• W1986278622 date "1995-03-01" @default.
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• W1986278622 title "New superconducting vanadomercury cuprates Hg0.8V0.2Ba2Cam−1CumO2m + 2 + δ" @default.
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• W1986278622 doi "https://doi.org/10.1016/0921-4534(94)00021-2" @default.
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