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- W1615742556 abstract "The magnitude of the oxygen isotope effect in the high-${T}_{c}$ superconductor Y${mathrm{Ba}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ has been determined by substitution of $^{18}mathrm{O}$ for $^{16}mathrm{O}$. A series of cross exchanges was performed on highquality polycrystalline specimens to eliminate uncertainties due to sample heat treatments and sample inhomogeneities. Magnetic measurements suggest a relative isotope shift for the bulk material of -0.17ifmmodepmelsetextpmfi{}0.03 K at 80% $^{18}mathrm{O}$ substitution, yielding ${ensuremath{alpha}}_{mathrm{bulk}}=0.019ifmmodepmelsetextpmfi{}0.004$ where ${T}_{c}ensuremath{sim}{M}^{ensuremath{-}ensuremath{alpha}}$ and $M$ is the oxygen mass. Resistivity measurements in freshly prepared specimens reveal filamentary superconductivity 1 or 2 K above the bulk superconducting transition temperature. The isotope shift associated with the filamentary superconductivity is similar to but slightly larger than the bulk shift: ${ensuremath{alpha}}_{mathrm{fil}}=0.028ifmmodepmelsetextpmfi{}0.003$. The filamentary superconductivity is time dependent and disappears several months after sample preparation. We show that the above values of $ensuremath{alpha}$ are inconsistent with the standard three-dimensional phonon-mediated Bardeen-Cooper-Schrieffer theory, and discuss implications for alternative possibilities." @default.
- W1615742556 created "2016-06-24" @default.
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- W1615742556 date "1989-02-01" @default.
- W1615742556 modified "2023-09-27" @default.
- W1615742556 title "Oxygen isotope study of YBa2Cu3O7" @default.
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- W1615742556 doi "https://doi.org/10.1103/physrevb.39.2269" @default.
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