Abstract
Magnetic critical neutron scattering from a single crystal of Cr+0.18 at. % Re was observed above its Néel transition (323 K) to an incommensurate spin density wave state. The data were analyzed in terms of the critical susceptibility model that successfully fit analogous data from single crystals of pure chromium and Cr+0.2 at. % V. An additional complication in this case is the fact that a small portion of the sample becomes commensurate antiferromagnetic at a temperature well above 323 K, which causes a commensurate magnetic Bragg peak that partially obscures the critical scattering near 323 K. The ‘‘Sato-Maki’’ form of incommensurate critical susceptibility fits the data reasonably well. The intensity of magnetic critical scattering in Cr+0.18 at. % Re is about a factor 2 stronger than in pure Cr, whereas in Cr+0.2 at. % V it is about the same factor weaker.
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