New interpolative treatment of the single-impurity Anderson model
Institut für Theoretische Physik,
Universität Bremen, Postfach 330440, D-28334 Bremen, Germany
Accepted: 23 February 1996
The many-body quasi-particle dynamics of the single-impurity Anderson model is investigated by means of the equations of motion for the higher-order Green's functions. It is shown that an interpolating approximation, which simultaneously reproduces the weak-coupling limit up to second order in the interaction strength U and the strong-coupling limit up to second order in the hybridization V (and thus also fulfils the atomic limit) can be formulated self-consistently.
PACS: 67.40.Db – Quantum statistical theory; ground state, elementary excitations / 71.28.+d – Narrow-band systems; heavy-fermion solids; intermediate-valence solids / 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
© EDP Sciences, 1996