Abstract
The third harmonics of the spin density wave in pure Cr, CrMn and CrV alloys were studied by means of neutron diffraction, and the following results were obtained. The phase relation between the third and the primary spin density wave was determined to be “rectangular like” in pure Cr and in CrMn alloy. The ratio of the amplitude of the third harmonics spin density wave to that of the primary spin density wave, | S 3 / S 1 |, increases in CrMn and decreases in CrV alloys compared with that of the pure Cr. These results can be qualitatively explained by both of the theories based on the two band nesting model and the virtual bound state approach to the spin density wave.
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