  We investigate a simple model of a frustrated spin-1/2 Heisenberg chain
coupled to adiabatic phonons under an external magnetic field. Using field
theoretic methods complemented by extensive Density Matrix Renormalisation
Group techniques generalized to include self-consistent lattice distortions, we
show that magnetization plateaux at non-trivial rational values of the
magnetization can be stabilized by the lattice coupling. We suggest that such a
scenario could be relevant for some low dimensional frustrated spin-Peierls
compounds.
