Lattice Dimerization in the Spin-Peierls Compound CuGeO$_3$
Condensed Matter
2009-10-31 v1
Abstract
The uniaxial pressure dependences of the exchange coupling and the structural distortion in the dimerized phase of CuGeO are analyzed. A minimum magnetic dimerization of 3 % is obtained, incompatible with an adiabatic approach to the spin-Peierls transition. Exploring the properties of an Heisenberg spin chain with dynamical spin-phonon coupling, the dimerization dependence of the spin excitation gap is found to be in qualitative agreement with experiment.
Keywords
Cite
@article{arxiv.cond-mat/9806022,
title = {Lattice Dimerization in the Spin-Peierls Compound CuGeO$_3$},
author = {B. Büchner and H. Fehske and A. P. Kampf and G. Wellein},
journal= {arXiv preprint arXiv:cond-mat/9806022},
year = {2009}
}
Comments
2 pages, 1 figure included