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- W2022661331 abstract "High volume fractions of the n=2 and n=3 members of a cuprate system of general formula ${mathrm{Hg}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Pb}}_{mathit{x}}$${mathrm{Ba}}_{2}$${mathrm{Ca}}_{mathit{n}mathrm{ensuremath{-}}1}$${mathrm{Cu}}_{mathit{n}}$${mathrm{O}}_{2mathit{n}mathrm{ensuremath{-}}2+mathrm{ensuremath{delta}}}$ (with an average value of x at 0.33) have been synthesized via a relatively facile process using low oxygen pressures. For as-synthesized n=3 (Hg,Pb-1:2:2:3) bulk superconducting critical temperatures (${mathit{T}}_{mathit{c}}$) of up to 133 K have been observed. For n=2 (Hg,Pb-1:2:1:2), which is obtained with some rare-earth-ion substitution at the calcium site, ${mathit{T}}_{mathit{c}}$ is 125 K after annealing in a reducing atmosphere. High-resolution lattice imaging coupled with structural simulations show that the Pb ions go into the Hg layer, leading to a chemical pressure-induced compositional modulation in this plane. Strong flux pinning and an irreversibility field of 1 T at 80 K are observed for Hg,Pb-1:2:2:3." @default.
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- W2022661331 date "1994-05-01" @default.
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- W2022661331 title "Superconductivity above 130 K in the Hg-Pb-Ba-Ca-Cu-O system" @default.
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- W2022661331 doi "https://doi.org/10.1103/physrevb.49.12322" @default.
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