Please use this identifier to cite or link to this item: 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
Keywords: Superconductivitat
Materials
Estructura electrònica
Superconductivity
Materials
Electronic structure
Issue Date: 1997
Publisher: The American Physical Society
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.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.56.5069
It is part of: Physical Review B, 1997, vol. 56, núm. 9, p. 5069-5072.
URI: http://hdl.handle.net/2445/10839
ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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