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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, Coen 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 |
| Related resource: | http://dx.doi.org/10.1103/PhysRevB.56.5069 |
| ISSN: | 0163-1829 |
| Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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|---|---|---|---|---|
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