J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
Page(s) C8-2119 - C8-2124
Proceedings of the International Conference on Magnetism

J. Phys. Colloques 49 (1988) C8-2119-C8-2124

DOI: 10.1051/jphyscol:19888951


J. Rossat-Mignod1, P. Burlet1, M. J. Jurgens1, 2, C. Vettier3, L. P. Regnault1, J. Y. Henry1, C. Ayache1, L. Forro1, H. Noel4, M. Potel4, P. Gougeon4 et J. C. Levet4

1  Centre d'Etudes Nucléaires de Grenoble, Département de Recherche Fondamentale, 85 X, 38041 Grenoble Cedex, France
2  From Kamerlingh Onnes Laboratory, Leiden, The Netherlands.
3  Institut Laue Langevin, 156 X, 38042 Grenoble Cedex, France
4  Laboratoire Chimie Minerale B, Université de Rennes I, 35042 Rennes, France

Neutron scattering experiments on single crystals have allowed an accurate determination of the magnetic phase diagram of YBa2Cu3O6+x. With increasing oxygen content the antiferromagnetic ordering of YBa2Cu3O6 and TN remain unchanged up to x = 0.2. For x > 0.2 both TN and the ordered moment of Cu2+ ions in the Cu(2) site decrease and vanish abruptly around x ≈ 0.40. The Cu+ ions in the Cu(1) site do not order for any oxygen content. For x = 0.30 a reentrant behaviour is observed. Preliminary inelastic neutron scattering experiments on a rather large single crystal (0.2cm3) with x ≈ 0.3 are reported.