Self-Consistent Dynamical Approach to Heavy-Fermion Systems

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Abstract
This paper studies the Anderson-lattice model using an extention of the non-crossing approximation (XNCA). The XNCA has already shown that the Kondo resonance in the f-electron density of states is enhanced by intersite interactions at temperature T higher than the Kondo temperature TK. This paper shows that at T>TK the static susceptibility χ Per f-electron site is correspondingly smaller than that of the dilute system. However, there Is a temperature (K) below which χ of the lattice system becomes the larger. The single-particle spectrum derived at TK shows that the quasi-particle renormalization factor is almost the same as that in the dilute system. Hence the Increase of χ is due to a large intersite contribution to the relevant Landau parameter.

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