Absence of collective effects in Heisenberg systems with localized magnetic moments

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Título:	Absence of collective effects in Heisenberg systems with localized magnetic moments
Autor/a:	Illas i Riera, Francesc; Moreira, Ibério de Pinho Ribeiro; Graaf, Cohen de; Castell, O.; Casanovas Salas, Jordi
Otros autores:	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.
Materia(s):	-Superconductivitat -Materials -Estructura electrònica -Superconductivity -Materials -Electronic structure
Derechos:	(c) The American Physical Society, 1997
Tipo de documento:	Artículo Artículo - Versión publicada
Editor:	The American Physical Society
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Illas i Riera, Francesc; Casanovas Salas, Jordi; García Bach, Ma. de los Ángeles; Caballol Lorenzo, Rosa; Castell, O.

Illas i Riera, Francesc; Casanovas Salas, Jordi; García Bach, Ma. de los Ángeles; Caballol Lorenzo, Rosa; Castell, O.

Moreira, Ibério de Pinho Ribeiro; Calzado, C. J.; Malrieu, J. P.; Illas i Riera, Francesc

Reta Mañeru, Daniel; Moreira, Ibério de Pinho Ribeiro; Illas i Riera, Francesc

Graff, Cohen de; Moreira, Ibério de Pinho Ribeiro; Illas i Riera, Francesc; Iglesias, Òscar; Labarta, Amílcar

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