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- W2019442975 abstract "In this paper, enhancement of the irreversibility field characteristics for the n=2 member of the Hg-12(n−1)n homologous series by optimizing hole density distribution is reported. The hole density distribution in the high-Tc layered copper oxides can be regarded as a source of anisotropy and also has been found to govern superconductivity properties such as transition temperature [M. Karppinen, H. Yamauchi, Philos. Mag. B, 79 (1999) 343–366], irreversibility field [H. Yamauchi, M. Karppinen, K. Fujinami, T. Ito, H. Suematsu, K. Matsuura, K. Isawa, Supercond. Sci. Technol., 11 (1998) 1006–1010], etc. In order to control the hole density distribution, solid solutions of HgBa2(Ca1−xYx)Cu2O6+δ (0≤x≤0.5) have been synthesized by an encapsulation technique and then post-annealed by a high-pressure oxidization (HPO) technique. The total amount of doped holes depends on both the amount of Y substitution for Ca (x) and that of excess oxygen in the HgOδ layer (δ). The former would reduce the hole density in the neighborhood of the CuO2 planes and the latter would increase the amount of holes especially in the charge reservoir (CR) block. The experimental data have demonstrated that the best Hirr-vs.-(1−T/Tc) characteristics is obtained by the excess oxygen doping solely, i.e. upon over-doping the samples. In such over-doped states, the Tc's tend to decrease. On the other hand, the samples simultaneously doped with small amounts of both yttrium and oxygen showed remarkably improved Hirr characteristics without large suppression of the Tc value." @default.
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- W2019442975 date "2000-08-01" @default.
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- W2019442975 title "Irreversibility-field enhancement by optimizing hole density distribution in the Hg-1212 superconductor" @default.
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- W2019442975 doi "https://doi.org/10.1016/s0921-4534(00)00205-7" @default.
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