Abstract
The properties of a periodic lattice distortion (strain wave) in Cr and its alloys have been studied in their incommensurate SDW state by X‐ray and neutron diffractions. The period of the strain wave is a half of that of SDW. The neutron data analysis under the assumption of the rigid spin model shows that the lattice expansion takes place at the loop of SDW. The maximum amplitude of the distortion is estimated from the satellite intensity of X‐ray as 0.25(±0.05) % of a lattice constant. Second and third harmonic components of the modulation are not observed within the experimental error. X‐ray measurements were also made for Cr(Fe) and Cr(Mn) alloys and show that the strain wave can be observed whenever the incommensurate SDW exists.The discontinuous expansion of the lattice was observed at the incommensurate‐commensurate transition temperature for each of these alloys. Both exchange striction and CDW models are the possible explanations of these properties.
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