We have grown by molecular-beam-epitaxy thin Cr(110) films on Nb(110) buffer layers on sapphire substrates. Films ranging from 50 {} to 1100 {} in thickness exhibit a single-domain structure. Using extensive x-ray characterization methods, we find a pronouced in-plane expansion of the Cr layers which relaxes as the film thickness increases, while the out-of-plane lattice spacing remains constant and bulklike over the entire thickness range. The in-plane lattice relaxation can be described by an isotropic strain relaxation model. In contrast, the out-of-plane behavior is highly anomalous, which may be due to strain density waves.
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Sonntag et al. (1994) studied this question.
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