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- W1640677440 abstract "Mossbauer studies $^{57}mathrm{Fe}$ in $R{mathrm{Ba}}_{2ensuremath{-}y}{mathrm{K}}_{y}{({mathrm{Cu}}_{1ensuremath{-}x}{mathrm{Fe}}_{x})}_{3}{mathrm{O}}_{z}$, with $R=mathrm{Y} mathrm{and} mathrm{Pr}$, $y=0 mathrm{and} 0.5$, $x=0.01,0.05, mathrm{and} 0.1$, and $z$ between 5.9 and 7.1, have been performed. A minority of the iron ions enter the Cu(2) site and reveal its magnetic order. For $R=mathrm{Y}$, $y=0$, and $x=0.1$, ${T}_{N}$ equals 280 and 415 K for $z=6.5 mathrm{and} 6.1$, respectively. The magnetic moments lie in the basal plane. In tetragonal, oxygen-rich Pr${mathrm{Ba}}_{2}$${({mathrm{Cu}}_{0.9}{mathrm{Fe}}_{0.1})}_{3}$${mathrm{O}}_{6.9}$, ${T}_{N}=325$ K; in superconducting Y${mathrm{Ba}}_{2}$${({mathrm{Cu}}_{0.9}{mathrm{Fe}}_{0.1})}_{3}$${mathrm{O}}_{7.1}$ there is no magnetic order. In nonsuperconducting Y${mathrm{Ba}}_{1.5}$${mathrm{K}}_{0.5}$${({mathrm{Cu}}_{0.95}{mathrm{Fe}}_{0.05})}_{3}$${mathrm{O}}_{6.1}$ two distinctly inequivalent magnetic iron sites are observed, corresponding to iron in the Cu(2) site with different Ba-K neighbors. Moments of iron ions that have three Ba and one K as first-nearest neighbors have a different temperature dependence and ${T}_{N}$ (${T}_{N}=450$ K) from those with four Ba neighbors, where ${T}_{N}=415$ K, showing that the antiferromagnetic exchange in the Cu(2) planes is strongly affected by the replacement of ${mathrm{Ba}}^{2+}$ by ${mathrm{K}}^{+}$, probably by repelling oxygen from the Cu(2) plane. In superconducting Y${mathrm{Ba}}_{1.5}$${mathrm{K}}_{0.5}$${({mathrm{Cu}}_{0.95}{mathrm{Fe}}_{0.05})}_{3}$${mathrm{O}}_{6.5}$ the iron site with ${T}_{N}=450$ K remains magnetic. The implications of these findings on the valencies of the Cu ions are discussed." @default.
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- W1640677440 date "1988-10-01" @default.
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- W1640677440 title "Magnetic order and superconductivity inRBa2Cu3Oz" @default.
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- W1640677440 doi "https://doi.org/10.1103/physrevb.38.6677" @default.
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