Abstract
Part of an optical spin-wave branch believed to correspond to the ua branch (H. Kaplan, Phys. Rev. 86: 121(1952)) was observed. The whole of the acoustic ( omega /sub 1/ branch in the STA00 1! direction was disclosed. The triple-axis spectrometer at the NRU reactor was used. The low-energy part of the acoustic branch was studied under high resolution, using the rotating-crystal spectrometer; results agree with other measurements. (L.N.N.)
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