Magneto-elastic excitations in spin-Peierls systems

Details Magneto-elastic excitations in spin-Peierls systems Magneto-elastic excitations in spin-Peierls systems

2000-06-09

arxiv.org/abs/cond-mat/0006169v1

Phys. Rev. B 63, 174417 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages revtex, 11 figures

Scientific paper

10.1103/PhysRevB.63.174417

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$^{-1}$ mode in CuGeO$_3$. Frustrated Heisenberg chains coupled to phonons satisfactory describe the pre-transitional quasi-elastic scattering in CuGeO$_3$. A real space interpretation of the quasi-elastic scattering is given justifying effective Ising model approaches.

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