The magnetism of iron
1979; American Physical Society; Volume: 19; Issue: 5 Linguagem: Inglês
10.1103/physrevb.19.2626
ISSN1095-3795
Autores Tópico(s)Theoretical and Computational Physics
ResumoA type of theory capable of reconciling the localized- and itinerant-electron models of a ferromagnetic metal is discussed. This kind of theory contemplates a distribution of "exchange field" configurations which correspond very roughly to the spin configurations of the localized model. Computations involve thermal averages over these configurations, each configuration $V$ having an effective energy $E(V)$. Starting from the band structure for ferromagnetic iron, the $E(V)$ have been estimated for certain configurations $V$. The results are reasonably consistent with the observed Curie temperature of iron, in spite of the presence of exchange fields \ensuremath{\sim}1-2 eV, and give some suggestion of behavior characteristic of the Heisenberg model.
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