Magneto-elastic excitations in spin-Peierls systems
Strongly Correlated Electrons
2009-10-31 v1
Abstract
Within the random phase approximation to the spin-Peierls transition two parameter regimes of phonon softening and hardening are present. Magneto-elastic excitations are discussed in detail for phonons coupled to the exactly solvable model of XY spin chains for both regimes, leading to a modified interpretation of the 30 cm mode in CuGeO. Frustrated Heisenberg chains coupled to phonons satisfactory describe the pre-transitional quasi-elastic scattering in CuGeO. A real space interpretation of the quasi-elastic scattering is given justifying effective Ising model approaches.
Cite
@article{arxiv.cond-mat/0006169,
title = {Magneto-elastic excitations in spin-Peierls systems},
author = {Michael Holicki and Holger Fehske and Ralph Werner},
journal= {arXiv preprint arXiv:cond-mat/0006169},
year = {2009}
}
Comments
12 pages revtex, 11 figures