Chromium and its dilute alloys are unique examples of magnetism caused by itinerant electrons. The magnetic excitations have been studied by inelastic neutron scattering using a high-resolution triple-axis spectrometer. Spin-wave peaks in q scans at constant energy transfer ℏω could, in general, not be clearly resolved at any temperature below TN but it is still possible to deduce the slope ω/q of the dispersion curve and also to estimate the spin-wave lifetimes. The scattering displays a divergence as q→0, ω→0, T→TN characteristic of critical fluctuations. The critical scattering is confined to small values of q, but the ω range is very wide compared to critical scattering from systems with localized magnetic moments. The experimental results agree generally with the theoretical predictions of Liu [Phys. Rev. Lett. 23, 311 (1969); Phys. Rev. (to be published)].
No takes yet. Share an insight, caveat, or question.
Als‐Nielsen et al. (1971) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: