  We define modulated replica symmetry breaking (RSB)-schemes which combine
tree- and wave-like structures. A modulated scheme and unmodulated RSB are
applied at 1-step level to a semiconductor model with antiferromagnetic
Korenblit-Shender interaction. By comparison of the free energies we find
evidence that a T=0 phase transition in the ferrimagnetic phase leads to a
transition between the different RSB-schemes. An embedding factor of Parisi
block matrices with sublattice-asymmetrical size is employed as a new
variational parameter in the modulated scheme.
