| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-1441 - C8-1442 | |
| DOI | https://doi.org/10.1051/jphyscol:19888661 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1441-C8-1442
DOI: 10.1051/jphyscol:19888661
1 Laboratoire de Physique des Solides, Bât. 510, Université Paris-Sud, 91405 Orsay, France
2 Clark University, Worcester, MA 01610, U.S.A.
3 Institut d'Electronique Fondamentale, Bât. 220, Université Paris-Sud, 91405 Orsay, France
J. Phys. Colloques 49 (1988) C8-1441-C8-1442
DOI: 10.1051/jphyscol:19888661
TEST OF THE HALDANE CONJECTURE IN A 1D-HEISENBERG (S = 1) ANTIFERROMAGNET BY OPTICAL LINEAR BIREFRINGENCE
J. Ferré1, J. P. Jamet1, C. P. Landee2, K. A. Reza2 et J. P. Renard31 Laboratoire de Physique des Solides, Bât. 510, Université Paris-Sud, 91405 Orsay, France
2 Clark University, Worcester, MA 01610, U.S.A.
3 Institut d'Electronique Fondamentale, Bât. 220, Université Paris-Sud, 91405 Orsay, France
Abstract
We report on optical linear birefringence measurements in the nearly ideal S = 1 Heisenberg antiferromagnetic chain compounds : Ni(C2H8N2)2 NO2 (ClO4) and Ni (C2H8N2)2NO2PF6. The temperature dependence of the magnetic contribution, proportional to that of the magnetic energy, indicates J/k = -53 K and supports the Haldane conjecture.