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- W2321797029 startingPage "6583" @default.
- W2321797029 abstract "We have calculated the transition temperature and the isotope shift for oxygen replacement for ${mathrm{La}}_{2ensuremath{-}x}{M}_{x}mathrm{Cu}{mathrm{O}}_{4}$ ($M=mathrm{Sr},mathrm{Ba}$) and $mathrm{Y}{mathrm{Ba}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}x}$, based on the lattice-dynamical calculations of these compounds with shell models. It is found that the experimental value of ${T}_{c}$ and the isotope shift $ensuremath{Delta}{T}_{c}$ for ${mathrm{La}}_{2ensuremath{-}x}{M}_{x}mathrm{Cu}{mathrm{O}}_{4}$ can be accounted for on the basis of McMillan's strong-coupling equation for ${T}_{c}$, supporting the conclusion that ${mathrm{La}}_{2ensuremath{-}x}{M}_{x}mathrm{Cu}{mathrm{O}}_{4}$ is a strong-coupling BCS superconductor. In contrast, experimental values of ${T}_{c}$ for $mathrm{Y}{mathrm{Ba}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}x}$ cannot be obtained on this basis. It is argued that expressing isotope shifts in terms of isotopic mass exponents ${ensuremath{alpha}}_{i}$ is not a useful procedure for these multi-ionic compounds." @default.
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- W2321797029 date "1988-10-01" @default.
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- W2321797029 title "Calculation of the isotope effect inLa2−xMxCuO7−xandYBa2Cu3O7−x" @default.
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- W2321797029 doi "https://doi.org/10.1103/physrevb.38.6583" @default.
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