Gunnarsson O., Schonhammer K.
The authors calculate the dynamic susceptibility of the Anderson impurity model using a 1/Nf expansion. For Nf= infinity a Fermi liquid sum rule is satisfied, and Im chi (w) shows a steep rise at w=TK. They also include crystal-field and spin orbit splitting and treat U< infinity . The relation to parameters derived from electron spectroscopy is discussed.
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