Abstract
We report observation of spin-pair excitations in Ba/sub 2/YCu/sub 3/O/sub 6+//sub delta/, with delta in the range 0.0--0.9. The frequency of the excitations, and hence the value of the exchange constant, J = 950 cm/sup -1/, is similar to that reported recently for (nonsuperconducting) La/sub 2/CuO/sub 4/. The present observation of magnetic excitations in a superconducting material, and of their evolution as a function of delta, demonstrate a large influence of carrier concentration on the spin-fluctuation dynamics.
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