Effective indirect multi-site spin-spin interactions in the s-d(f) model

[摘要] Using the diagram technique for Matsubara Green's functions it is shown that the dynamics of the localized spin subsystem in the s-d(f) model can be described in terms of an effective spin model with multi-site spin-spin interactions. An exact representation of the action for the effective purely spin model is derived as an infinite series in powers of s-d(f) exchange interaction J. The indirect interactions of the 2nd, 3rd and 4th order are discussed.

[发布日期] 2017-10-15

[效力级别]  Proceedings Paper

[关键词] s-d(f) exchange model;Mult i-site spin-spin interactions