Gt. Baumbach et al., Investigation of strain induced patterning in superlattices by grazing incidence diffraction - comparison of morphological and strain ordering, J PHYS D, 32(10A), 1999, pp. A212-A215
Symmetrically strained superlattices on off-oriented substrates are studied
by x-ray grazing incidence diffraction in order to investigate composition
al ordering separately from the related lattice strain correlation dependin
g on the lattice mismatch. Narrow grating rods in strain-insensitive recipr
ocal space maps indicate a remarkably periodic lateral morphological orderi
ng. Significant differences are observed in strain sensitive maps, where gr
ating rod broadening indicates strain fluctuations. From the inclination of
satellite branches in the maps, the direction of interface replication and
of strain replication can be determined separately for the strained layer
superlattice and for the low strained capping layers.