Use of Non-orthogonal Wave Functions in the Treatment of Solids, with Applications to Ferromagnetism
- 1 October 1953
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 92 (1), 28-35
- https://doi.org/10.1103/physrev.92.28
Abstract
It is proved by a rearrangement of Löwdin's solution to the many-body problem that a vector model type energy expression is valid for a solid provided (in the simplest case of one electron per atom) the number of nearest neighbors times the overlap integral between them is small compared with unity.Keywords
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