Absence of collective effects in Heisenberg systems with localized magnetic moments

All of RECERCAT

To access the full text documents, please follow this link: http://hdl.handle.net/2445/10839

Title:	Absence of collective effects in Heisenberg systems with localized magnetic moments
Author:	Illas i Riera, Francesc; Moreira, Ibério de Pinho Ribeiro; Graaf, Cohen de; Castell, O.; Casanovas Salas, Jordi
Other authors:	Universitat de Barcelona
Abstract:	Existence of collective effects in magnetic coupling in ionic solids is studied by mapping spin eigenstates of the Heisenberg and exact nonrelativistic Hamiltonians on cluster models representing KNiF3, K2NiF4, NiO, and La2CuO4. Ab initio techniques are used to estimate the Heisenberg constant J. For clusters with two magnetic centers, the values obtained are about the same for models having more magnetic centers. The absence of collective effects in J strongly suggests that magnetic interactions in this kind of ionic solids are genuinely local and entangle only the two magnetic centers involved.
Subject(s):	-Superconductivitat -Materials -Estructura electrònica -Superconductivity -Materials -Electronic structure
Rights:	(c) The American Physical Society, 1997
Document type:	Article Article - Published version
Published by:	The American Physical Society
Share: