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- W2056057162 abstract "Raman scattering experiments have been carried out on sintered pellets of ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}^{18}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathit{x}}$ and ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}^{16}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathit{x}}$, obtained both by gas exchange and by growth with substituted oxides. The frequencies of the modes at 340, 435, and 500 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, which involve motion of the oxygen atoms and which shift significantly upon oxygen-isotope substitution, have been measured for several sets of samples. The 500-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ line of the $^{18}mathrm{O}$ samples is observed to be isotope shifted to a lesser degree than the 340- and 435-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ phonons, and is significantly broadened. To model the observed behavior of the 500-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ mode, a linear chain of O and Cu atoms is used to compute first-order kensuremath{simeq}0 Raman cross sections from 400 to 600 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$. Disorder is introduced by randomly substituting $^{18}mathrm{O}$ atoms for $^{16}mathrm{O}$ atoms at positions in the chain corresponding to O(4) in the ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ lattice. Comparison of computed and experimental spectra suggest that the maximum linewidth in the 500-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ peak occurs for a relative $^{18}mathrm{O}$ concentration ${[}^{18}$O(4)]/${[}^{16}$O(4)] between 24% and 36%. In addition, the 502-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ peak position is found to depend nonlinearly on the relative $^{18}mathrm{O}$ concentration. The implications of these results are discussed in terms of the currently accepted models for oxygen-isotope exchange in ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$" @default.
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- W2056057162 date "1991-02-01" @default.
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- W2056057162 title "Modeling oxygen isotope shifts and line-broadening effects of the 502-cm−1Raman mode ofYBa2Cu3O7−x" @default.
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- W2056057162 doi "https://doi.org/10.1103/physrevb.43.2771" @default.
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