Volume 43, Number 4, August II 1998
|Page(s)||463 - 468|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Dopant-bound spinons in
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
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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