Fe x /Ru y hexagonal close-packed superlattices have been grown by MBE with various layers thickness 4 ⩽ x ⩽ 12 Å and 4 ⩽ y ⩽ 52 Å. The superlattices show fully h.c.p. structure with sharp interfaces and with a periodic modulation along the [0001] growth axis. The h.c.p.-Fe layers correspond to a specific volume of 12.5 Å 3 per Fe atom, much larger than in regular close packed phases (11.3 Å 3 ), which is likely related to a high-spin state for Fe.
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Maurer et al. (1989) studied this question.
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