| Issue |
Europhys. Lett.
Volume 56, Number 6, December 2001
|
|
|---|---|---|
| Page(s) | 877 - 883 | |
| Section | Condensed matter: electronic structure, electrical magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00601-y | |
| Published online | 01 December 2003 | |
Raman response in antiferromagnetic two-leg S=1/2 Heisenberg ladders
Institut für Theoretische Physik, Universität zu
Köln Zülpicher Str. 77, D-50937 Köln, Germany
Received:
26
July
2001
Accepted:
4
October
2001
The Raman response in the antiferromagnetic 2-leg S=1/2
Heisenberg ladder is calculated for various couplings by
continuous unitary transformations. For leg couplings above 80%
of the rung coupling a characteristic 2-peak structure occurs
with a point of zero intensity within the continuum.
Experimental data for 
and
y
are analyzed and the coupling constants are determined. Evidence
is found that the Heisenberg model is not sufficient to describe
cuprate ladders. We argue that a cyclic exchange term is the
appropriate extension.
PACS: 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.50.Ee – Antiferromagnetics / 75.10.Jm – Quantized spin models
© EDP Sciences, 2001
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