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Absence of collective effects in Heisenberg systems with localized magnetic moments
Illas i Riera, Francesc; Moreira, Ibério de Pinho Ribeiro; Graaf, Cohen de; Castell, O.; Casanovas Salas, Jordi
Universitat de Barcelona
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.
04-05-2010
Superconductivitat
Materials
Estructura electrònica
Superconductivity
Materials
Electronic structure
(c) The American Physical Society, 1997
Artículo
The American Physical Society
         

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