Isotope effect in the high-Tc superconductors Ba2YCu3O7 and Ba2EuCu3O7

The effect of isotopic substitution on the superconducting Tc in the 90-K superconductors Ba2YCu3O7 and Ba2EuCu3O7 by replacing O-16 with the heavier isotope O-18 is investigated. Samples with approximately 75 percent of the O-16 replaced by O-18 were prepared by gas-phase ion exchange. In these sam...

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Bibliographic Details
Published in:Physical review letters 1987-06, Vol.58 (22), p.2333-2336
Main Authors: BATLOGG, B, CAVA, R. J, SHORT, K. T, MUJSCE, A. M, RIETMAN, E. A, JAYARAMAN, A, VAN DOVER, R. B, KOUROUKLIS, G. A, SUNSHINE, S, MURPHY, D. W, RUPP, L. W, CHEN, H. S, WHITE, A
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Occurrence, potential candidates
Physics
Superconductivity
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Summary:The effect of isotopic substitution on the superconducting Tc in the 90-K superconductors Ba2YCu3O7 and Ba2EuCu3O7 by replacing O-16 with the heavier isotope O-18 is investigated. Samples with approximately 75 percent of the O-16 replaced by O-18 were prepared by gas-phase ion exchange. In these samples the phonon frequencies, measured by Raman spectroscopy, are reduced by the expected about 4 percent. The transition temperatures, however, are found to change by less than 0.2 percent. This change in Tc is much less than that expected for strongly coupled phonon-mediated superconductivity. (Author)
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.58.2333