Статья

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B. BatloggAT&T Bell Laboratories, Murray Hill, New Jersey 07974R. J. CavaAT&T Bell Laboratories, Murray Hill, New Jersey 07974A. JayaramanAT&T Bell Laboratories, Murray Hill, New Jersey 07974R. B. van DoverAT&T Bell Laboratories, Murray Hill, New Jersey 07974G. A. KourouklisAT&T Bell Laboratories, Murray Hill, New Jersey 07974S. A. SunshineAT&T Bell Laboratories, Murray Hill, New Jersey 07974D. W. MurphyAT&T Bell Laboratories, Murray Hill, New Jersey 07974L. W. RuppAT&T Bell Laboratories, Murray Hill, New Jersey 07974H. S. ChenAT&T Bell Laboratories, Murray Hill, New Jersey 07974Alice E. WhiteAT&T Bell Laboratories, Murray Hill, New Jersey 07974K. T. ShortAT&T Bell Laboratories, Murray Hill, New Jersey 07974A. M. MujsceAT&T Bell Laboratories, Murray Hill, New Jersey 07974Edward A. RietmanAT&T Bell Laboratories, Murray Hill, New Jersey 07974

1987lv

ABI

Аннотация

We have studied the effect of isotopic substitution on the superconducting ${T}_{c}$ in the 90-K superconductors ${\mathrm{Ba}}_{2}$Y${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ and ${\mathrm{Ba}}_{2}$Eu${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ by replacing $^{16}\mathrm{O}$ with the heavier isotope $^{18}\mathrm{O}$. Samples with approximately 75% of the $^{16}\mathrm{O}$ replaced by $^{18}\mathrm{O}$ were prepared by gas-phase ion exchange. In these samples the phonon frequencies, measured by Raman spectroscopy, are reduced by the expected \ensuremath{\sim}4%. The transition temperatures, however, are found to change by less than 0.2%. This change in ${T}_{c}$ is much less than that expected for strongly coupled phonon-mediated superconductivity.

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Идентификаторы

DOI: 10.1103/physrevlett.58.2333

Цитирования и источники

Цитирований: 3Использованных источников: 0

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