| Issue |
Europhys. Lett.
Volume 43, Number 4, August II 1998
|
|
|---|---|---|
| Page(s) | 463 - 468 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00382-3 | |
| Published online | 01 September 2002 | |
Dopant-bound spinons in 
1
II. Physikalisches Institut, RWTH-Aachen, Templergraben 55,
D-52056 Aachen, Germany
2
Institut für Theoretische Physik, Universität zu Köln, Zülpicherstraße 77, D-50937 Köln, Germany
3
Department of Physics, Aoyama Gakuin University, 6-16-1 Chitsedai, Setagaya-ku, Tokyo 157, Japan
4
Laboratoire de Chimie des Solides, Université
de Paris-Sud, Bâtiment 414, F-91405 Orsay, France
Received:
23
March
1998
Accepted:
30
June
1998
Polarized inelastic light scattering experiments on
(
) single crystals
show for 
a new distinct mode at nearly half the energy of
the singlet response below the spin-Peierls transition.
The temperature, magnetic field, polarization, and doping dependences
of this mode are similar to those of the singlet bound state. The data
are interpreted in terms of a spinon-assisted light scattering process.
Position and form of the peak provide strong evidence for the presence
of dopant-bound spinons in .
PACS: 75.40.Gb – Dynamic properties (susceptibility, spin waves, etc.) / 78.35.+c – Brillouin and Rayleigh scattering; other light scattering / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 1998
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