| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|
|---|---|---|
| Page(s) | C8-1433 - C8-1434 | |
| DOI | https://doi.org/10.1051/jphyscol:19888657 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1433-C8-1434
DOI: 10.1051/jphyscol:19888657
1 Hahn-Meitner-Institut, D-1000 Berlin 39, F.R.G.
2 Physics Department, Tohoku University, Aoba Aramaki, 980 Sendai, Japan
3 Physics Department, Riso National Laboratory, DK-4000 Roskilde, Denmark
4 Laboratoire Leon Brillouin, CEN Saclay, France
5 LANSCE, Los Alamos National Laboratory, New Mexico 87545, U.S.A.
6 Fukuoka Institute of Technology, 811-01 Fukuoka, Japan
J. Phys. Colloques 49 (1988) C8-1433-C8-1434
DOI: 10.1051/jphyscol:19888657
NEUTRON SCATTERING EXPERIMENTS ON THE HALDANE CONJECTURE
K. Kakurai1, 2, M. Steiner1, J. K. Kjems3, D. Petitgrand4, R. Pynn5 et K. Hirakawa61 Hahn-Meitner-Institut, D-1000 Berlin 39, F.R.G.
2 Physics Department, Tohoku University, Aoba Aramaki, 980 Sendai, Japan
3 Physics Department, Riso National Laboratory, DK-4000 Roskilde, Denmark
4 Laboratoire Leon Brillouin, CEN Saclay, France
5 LANSCE, Los Alamos National Laboratory, New Mexico 87545, U.S.A.
6 Fukuoka Institute of Technology, 811-01 Fukuoka, Japan
Abstract
Polarized neutron study of the spin dynamics for a Heisenberg antiferromagnet with easy-axis anisotropy, CsNiCl3, clearly demonstrates the almost isotropic character of the system. The study also revealed a difference between the observed and the calculated spin wave dispersion using the classical spin wave theory for T << 4.8 K and T > 4.8 K. This may be interpreted as a quantum effect on the spin dynamics in one and three dimension, as has been suggested by Haldane for one dimension.