Mixing of magnetic and phononic excitations in incommensurate spin-Peierls systems
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...
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2001
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v63_n14_p_Dobry http://hdl.handle.net/20.500.12110/paper_10980121_v63_n14_p_Dobry |
| Aporte de: |
| Sumario: | 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 magnetophonon state with the energy of the gap. We emphasize that our results are relevant for the Raman spectra of the inorganic spin-Peierls material CuGeO3. © 2001 The American Physical Society. |
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