Mixing of magnetic and phononic excitations in incommensurate Spin-Peierls systems

Details Mixing of magnetic and phononic excitations in incommensurate Spin-Peierls systems Mixing of magnetic and phononic excitations in incommensurate Spin-Peierls systems

2000-09-06

arxiv.org/abs/cond-mat/0009091v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, latex, 2 figures embedded in the text

Scientific paper

10.1103/PhysRevB.63.144404

We analyze the excitation spectra of a spin-phonon coupled chain in the presence of a soliton. This is taken as a microscopic model of a Spin-Peierls material placed in a high magnetic field. We show, by using a semiclassical approximation in the bosonized representation of the spins that a trapped magnetic state obtained in the adiabatic approximation is destroyed by dynamical phonons. Low energy states are phonons trapped by the soliton. When the magnetic gap is smaller than the phonon frequencies the only low energy state is a mixed magneto-phonon state with the energy of the gap. We emphasize that our results are relevant for the Raman spectra of the inorganic Spin-Peierls material CuGeO$_3$.

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