Spin fluctuations and superconductivity in Ba2YCu3O6

K. B. Lyons, P. A. Fleury, L. F. Schneemeyer, J. V. Waszczak

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We report observation of spin-pair excitations in Ba2YCu3O6, with in the range 0.0-0.9. The frequency of the excitations, and hence the value of the exchange constant, J=950 cm-1, is similar to that reported recently for (nonsuperconducting) La2CuO4. The present observation of magnetic excitations in a superconducting material, and of their evolution as a function of, demonstrate a large influence of carrier concentration on the spin-fluctuation dynamics.

Original languageEnglish
Pages (from-to)732-735
Number of pages4
JournalPhysical Review Letters
Issue number8
StatePublished - 1988


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