TY - JOUR
T1 - Two Anderson impurities in the framework of the non-crossing approximation
T2 - Spectral functions and spin correlations
AU - Schiller, A.
AU - Zevin, V.
PY - 1996
Y1 - 1996
N2 - Using a novel slave boson mapping, which was recently proposed by us for two Anderson impurities embedded in a metal, we present here spectral functions for all pseudoparticles involved in the mapping. These were numerically calculated in the framework of the Non-Crossing Approximation for different temperatures and inter-impurity distances, both for the degenerate (Nf = 6) and nondegenerate (Nf = 2) models. For the nondegenerate case, temperature dependencies of the partial occupancies and the spin-spin correlation function suggest that an antiferromagnetic (AFM)-like ground state is formed at suitable inter-impurity separation. By contrast, Kondo quenching of the impurity moments takes place for the isotropic Nf = 6 case even when a direct AFM interaction is introduced in order to amplify the indirect (inherent) one. Numerical calculations are in agreement with our previous prediction [Phys. Rev. B 47, 14,297 (1993)] that no AFM-like ground state can appear for two isotropic degenerate impurities.
AB - Using a novel slave boson mapping, which was recently proposed by us for two Anderson impurities embedded in a metal, we present here spectral functions for all pseudoparticles involved in the mapping. These were numerically calculated in the framework of the Non-Crossing Approximation for different temperatures and inter-impurity distances, both for the degenerate (Nf = 6) and nondegenerate (Nf = 2) models. For the nondegenerate case, temperature dependencies of the partial occupancies and the spin-spin correlation function suggest that an antiferromagnetic (AFM)-like ground state is formed at suitable inter-impurity separation. By contrast, Kondo quenching of the impurity moments takes place for the isotropic Nf = 6 case even when a direct AFM interaction is introduced in order to amplify the indirect (inherent) one. Numerical calculations are in agreement with our previous prediction [Phys. Rev. B 47, 14,297 (1993)] that no AFM-like ground state can appear for two isotropic degenerate impurities.
KW - Kondo effect
KW - Magnetic impurities
KW - Ruderman-Kittel-Kasuya-Yoshida interaction
UR - http://www.scopus.com/inward/record.url?scp=0029698753&partnerID=8YFLogxK
U2 - 10.1002/andp.2065080406
DO - 10.1002/andp.2065080406
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AN - SCOPUS:0029698753
SN - 0003-3804
VL - 508
SP - 363
EP - 386
JO - Annalen der Physik
JF - Annalen der Physik
IS - 4
ER -