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

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

1999-08-09

arxiv.org/abs/cond-mat/9908134v2

Physics

Condensed Matter

Statistical Mechanics

final version, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.61.6741

The introduction of modified bond-defects in spin-Peierls systems is investigated in a model of antiferromagnetic Heisenberg spin chains coupled to adiabatic phonons. Generically, new low-energy magnetic or non-magnetic excitations appear below the bulk spin gap energy. When two adjacent bonds are modified, these excitations can be interpreted in terms of boundstates of a soliton with the localized spin-1/2 located on the impurity site. It is shown that the confining potential occurs even in the case of {\it isolated} chains.

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