PROGRES ET PERSPECTIVES
J. Phys. IV France 02 (1992) C3-197-C3-197
Onset of magnetism in transition-metal monolayers : V and Rh on Ag(001)A. MOKRANI1, H. DREYSSÉ2, S. BOUARAB3 and C. DEMANGEAT3
1 Laboratoire de Physique du Solide Théorique, 2 Rue de la Houssinière, 44072 Nantes, France
2 Laboratoire de Physique des Solides, BP. 239, 54506 Vandoeuvre-les-Nancy, France
3 IPCMS, UMR46, Université Louis Pasteur, 4 Rue Blaise Pascal, 67070 Strasbourg, France
We discuss the onset of magnetic structures in very thin V and Rh overlayer slabs on an Ag(001) substrate in terms of the exchange integral J. We use a self-consistent real-space tight-binding method in the unrestricted Hartree-Fock approximation to the Hubbard Hamiltonian. In both cases, the results display onset of magnetism essentially in the monolayer range. For thicker coverage of Ag(001), the magnetism is quickly killed. This thickness dependence of the magnetism may explain discrepancies between the experimental results performed with various techniques in different groups, in the case of V on Ag(001). Our simple model for Rh on Ag(001) is not able to reproduce the experimental situation plagued by interdiffusion.
© EDP Sciences 1992