| Issue |
Europhys. Lett.
Volume 37, Number 3, January III 1997
|
|
|---|---|---|
| Page(s) | 189 - 194 | |
| Section | Classical areas of phenomenology | |
| DOI | https://doi.org/10.1209/epl/i1997-00102-1 | |
| Published online | 01 September 2002 | |
Spin dynamics of dimerized Heisenberg chains
1
Physics Department, University of Wuppertal - 42097 Wuppertal, Germany
2
Institut für Physik, Universität Dortmund - 44221 Dortmund, Germany
Received:
18
July
1996
Accepted:
12
December
1996
We study numerically the dimerized Heisenberg
model with frustration appropriate for the
quasi-1D spin-Peierls compound 
.
We present evidence for a bound state in
the dynamical structure factor for any finite
dimerization δ and estimate the respective
spectral weight. For the homogeneous case
(
) we show that the spin-wave velocity
vs
is renormalized by the n.n.n. frustration term
α as
with 
.
PACS: 42.65.-k – Nonlinear optics / 78.20.-e – Optical properties of bulk materials and thin films / 78.20.Ls – Magnetooptical effects
© EDP Sciences, 1997
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