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The excitation spectrum of the incommensurate spin-density wave in chromium metal has been investigated by neutron scattering. It is found that the high-velocity mode originating from the magnetic satellite positions is not a simple spin wave but at low frequency is a longitudinal excitation. Additional excitation branches, which cross at the (100) position at a frequency corresponding to the "commensurate" feature seen in previous studies, were also observed.
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Burke et al. (1983) studied this question.
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