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The introduction of modified bond-defects in spin-Peierls systems isinvestigated in a model of antiferromagnetic Heisenberg spin chains coupled toadiabatic phonons. Generically, new low-energy magnetic or non-magneticexcitations appear below the bulk spin gap energy. When two adjacent bonds aremodified, these excitations can be interpreted in terms of boundstates of asoliton with the localized spin-1/2 located on the impurity site. It is shownthat the confining potential occurs even in the case of {\it isolated} chains.Comment: final version, to appear in Phys. Rev.

Low-energy excitations of spin-Peierls chains with modified bond impurities