Ordered phases in spin-Peierls systems

The microscopic description of spin-Peierls substances is discussed. Partic ular attention is paid to the ordered (dimerised and incommensurably modula ted) phases. Important points are the adiabatic and the antiadiabatic appro ach, generic soliton forms, elastic and magnetic interchain couplings. The wealth and the accuracy of experimental information collected for the first inorganic spin-Peierls substance CuGeO3 motivates this work. (C) 2000 Else vier Science B.V. All rights reserved.