Portal de Periódicos da CAPES

Interorbital correlation effects on heavy-electron systems

2012; American Physical Society; Volume: 85; Issue: 23 Linguagem: Inglês

10.1103/physrevb.85.235148

1550-235X

Tsuneya Yoshida, Norio Kawakami,

Advanced Condensed Matter Physics

We study an extended periodic Anderson model, which includes correlations between conduction and $f$ electrons, by employing dynamical mean field theory and continuous-time quantum Monte Carlo simulations. It is clarified how the antiferromagnetic phase, which is stabilized in the ordinary periodic Anderson model, changes into a charge ordered (CO) phase in the strong $c$-$f$ interaction region. A systematic analysis of the effects due to the hybridization and the $c$-$f$ interaction evidences the existence of a critical end point for the CO transition; the quantum phase transition between the CO phase and the paramagnetic phase is of first (second) order in the weak (moderate) hybridization region. We also address the effects of the Hubbard-type correlations among conduction electrons on the phase diagram.