1/N corrections to the binding energy of an Anderson model fluctuating between two magnetic configurations
Landgraf, J. M.; Rasul, J. W.
1994-01-03
Citation
Landgraf, J M; Rasul, J W (1994). "1/N corrections to the binding energy of an Anderson model fluctuating between two magnetic configurations." Journal of Physics: Condensed Matter. 6(1): 203-222. <http://hdl.handle.net/2027.42/48873>
Abstract
The authors investigate the binding energy separation between the many-body ground-state singlet and higher-lying magnetic states for the f1-f2 Anderson model to next-leading order in the 1/N expansion, where N denotes the orbital degeneracy of the f states. They formulate integral equations for the magnetic-state amplitudes that appear at next-leading order in 1/N and solve these, together with the integral equations that describe the singlet, numerically. They find that the total separation between magnetic and singlet states is small, even in the valence-fluctuation regime, and hence demonstrate the robustness of the leading-order result. They find that the maximum binding-energy separation is shifted towards higher valence, in contradiction to results of the minimal-degeneracy model. They also present results for the valence and charge susceptibility.Publisher
IOP Publishing Ltd
ISSN
0953-8984
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