Variational Theory for Two-Impurity Anderson Model | Zendy

Tetsuro Saso | Zendy; Hiroaki Kato | Zendy

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Variational Theory for Two-Impurity Anderson Model

Author(s) -

Tetsuro Saso,

Hiroaki Kato

Publication year - 1992

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp/87.2.331

Subject(s) - physics , anderson impurity model , condensed matter physics , antiferromagnetism , impurity , degenerate energy levels , kondo effect , magnetic impurity , magnetization , coupling (piping) , kondo model , fermion , order (exchange) , quantum mechanics , magnetic field , materials science , finance , economics , metallurgy

In order to investigate the competition between the Kondo effect and the intersite magnetic interaction in heavy Fermion systems, two-impurity Anderson model is studied by the variational method. Uniform and staggered magnetic susceptibilities are calculated. The staggered susceptibility χ s is enchanced when the magnitude of the antiferromagnetic coupling J between the two impurities becomes of the order of the Kondo temperature T k (1) of a single impurity. χ s diverges at J∼o(T k (1) ) for an N-fold degenerate orbital model when N→∞

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