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High-quality single-crystal Co/Cr(001) superlattices with layer thicknesses of 5--50 A{} have been grown by molecular-beam epitaxy. In contrast to other investigations we found that hcp Co grows with its (11.0) plane parallel to Cr(001). The Co layers exhibit a remarkable expansion of {}6% perpendicular to the film plane, indicating a structural change in direction to the bcc phase. However, in-plane diffraction experiments confirmed that the hexagonal symmetry remains for Co layer thicknesses down to 4 A{}.
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Donner et al. (1993) studied this question.
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