Magnetic properties of small Yttrium clusters |
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| Authors: | R Guirado-López D Spanjaard M-C Desjonquères |
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| Institution: | (1) Laboratoire de Physique des Solides, Université Paris-Sud, Batiment 510, 91405 Orsay, France, FR;(2) Service de Recherche sur les Surfaces et l'Irradiation de la Matière, CE-Saclay, 91191 Gif-sur-Yvette, France, FR |
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| Abstract: | The magnetic properties of small YN clusters are studied by using a tight-binding Hubbard Hamiltonian in the unrestricted Hartree-Fock approximation. Several
types of cluster geometries are considered in order to see the effects of the size and symmetry of the structures on the magnetic
properties. The average magnetic moments are found to be constant over large domains of variations in the interatomic distance, a fact that can be explained by the
existing closed shell electronic configurations at least for one spin direction in all our magnetic solutions. Small energy
gains upon the onset of magnetization are obtained, which reveals the low stability of the magnetic solutions. Our results
contradict the prediction of a magnetic-nonmagnetic transition at a large cluster size (about 90 atoms) for these kinds of
systems.
Received: 27 April 1998 / Received in final form: 23 June 1998 / Accepted: 17 July 1998 |
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| Keywords: | PACS 36 40 Cg Electronic and magnetic properties of clusters - 61 46 +w Clusters nanoparticles and nanocrystalline materials |
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