Gutzwiller Method for an Extended Periodic Anderson Model with the c-f Coulomb Interaction

TL;DR

This paper investigates how the Coulomb interaction between conduction and f electrons affects the phase behavior and effective mass in an extended periodic Anderson model, revealing sharper crossovers and phase transitions.

Contribution

It introduces the Gutzwiller method to analyze the extended model with Ucf, highlighting the emergence of first-order transitions and mass enhancements across regimes.

Findings

Sharpened crossovers with increasing Ucf

First-order phase transitions at large Ucf

Mass enhancement in both Kondo and intermediate-valence regimes

Abstract

We study an extended periodic Anderson model with the Coulomb interaction Ucf between conduction and f electrons by the Gutzwiller method. The crossovers between the Kondo, intermediate-valence, and almost empty f-electron regimes become sharper with Ucf, and for a sufficiently large Ucf, become first-order phase transitions. In the Kondo regime, a large enhancement in the effective mass occurs as in the ordinary periodic Anderson model without Ucf. In addition, we find that a large mass enhancement also occurs in the intermediate-valence regime by the effect of Ucf.