Abstract
Structures of artificial superlattices of a PbSe-SnSe couple grown on the NaCl (100) by evaporation were investigated by the X-ray diffraction and the cross-sectional transmission electron microscopy. PbSe and SnSe have different crystal structures and a large lattice mismatch. The superlattices, (PbSe)m(SnSe)n adopt four types of lattice structures depending on m and n.The single crystal films of (CoO)m(NiO)n superlattices were grown on the single crystal α-Al2O3 (0001) by reactive evaporation. The superlattices with the good crystalline quality revealed well-defined satellite X-ray peaks due to an artificial period. A magnetic Bragg peak indexed as (1/2 1/2 1/2) in neutron dif-fraction pattern was observed for superlattices with each layer less than 2 nm (m, n≤8) and a magnetic structure type FCC2 with spin axis lying in the (111) plane grown was suggested. The Néel temperature was found to vary as a linear function of n/(m+n).
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