Domain excitations in spin-Peierls systems

Details Domain excitations in spin-Peierls systems Domain excitations in spin-Peierls systems

1997-12-19

arxiv.org/abs/cond-mat/9712239v2

Physics

Condensed Matter

Statistical Mechanics

5 pages, 2 figures, corrected version to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.58.3124

We study a model of a Spin-Peierls material consisting of a set of antiferromagnetic Heisenberg chains coupled with phonons and interacting among them via an inter-chain elastic coupling. The excitation spectrum is analyzed by bosonization techniques and the self-harmonic approximation. The elementary excitation is the creation of a localized domain structure where the dimerized order is the opposite to the one of the surroundings. It is a triplet excitation whose formation energy is smaller than the magnon gap. Magnetic internal excitations of the domain are possible and give the further excitations of the system. We discuss these results in the context of recent experimental measurements on the inorganic Spin-Peierls compound CuGeO$_3$

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