Exchange Interaction between Nearest-Neighbor Ion Pairs. I.in KMg
- 10 February 1967
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 154 (2), 487-492
- https://doi.org/10.1103/physrev.154.487
Abstract
The configuration-interaction method is applied to the exchange interaction between nearest-neighbor ion pairs in KMg. A linear cation-anion-cation four-electron model is assumed, taking into account the ionic configuration as well as anion-cation and cation-cation charge-transfer excitations. Numerical estimates indicate that the charge-transfer excitation between the cations is more important than that from an anion to its neighboring cation. These two charge-transfer processes together with the ionic configuration contribute the majority of the exchange interaction. The overlap integral between two neighboring cation orbitals is also taken into account, and its contributions to the exchange integral are examined and found to be significant.
Keywords
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