| Issue |
Europhys. Lett.
Volume 35, Number 1, July I 1996
|
|
|---|---|---|
| Page(s) | 55 - 60 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00530-3 | |
| Published online | 01 September 2002 | |
Spin-waves in the mid-infrared spectrum of antiferromagnetic YBa2Cu3O6.0
1
Institut für angewandte Physik, Universität Karlsruhe -
D-76128 Karlsruhe, Germany
2
Institut für Theorie der
kondensierten Materie, Universität Karlsruhe,
D-76128 Karlsruhe, Germany
Received:
7
February
1996
Accepted:
16
May
1996
The mid-infrared spin-wave spectrum of antiferromagnetic
was determined by infrared transmission and
reflection measurements (
at 
K.
Excitation of single magnons of the optical branch was observed at
meV. Two further peaks at 
meV
(
) and 
meV (
)
both belong to the two-magnon spectrum. Linear spin-wave theory is in good agreement
with the measured two-magnon spectrum, and allows to determine
the exchange constant J to be about 
meV,
whereas the intrabilayer coupling J12 is approximately 0.5J.
PACS: 74.72.-h – High-Tc cuprates / 74.25.Gz – Superconductivity: Optical properties / 74.25.Ha – Superconductivity: Magnetic properties
© EDP Sciences, 1996
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