80 research outputs found
Exchange interaction between -multiplets
Analytical expressions for the exchange interaction between -multiplets of
interacting metallic centers are derived on the basis of a complete electronic
model. A common belief that this interaction can be approximated by an
isotropic form (or in the case of interaction with an isotropic
spin) is found to be ungrounded. It is also shown that the often used "1/U
approximation" for the description of the kinetic contribution of the exchange
interaction is not valid in the case of -multiplets. The developed theory
can be used for microscopic description of exchange interaction in materials
containing lanthanides, actinides and some transition metal ions.Comment: 20 pages, 3 figure
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