29 citations · 93 across the 12 of their papers we have counts for
12 papers
Study of the Kondo and high-temperature limits of the slave-boson and X-boson methods
Lizardo H. C. M. Nunes, M. S. Figueira, M. E. Foglio
In this Letter we study the periodic Anderson model, employing both the slave-boson and the X-boson approaches in the mean field approximation. We investigate the breakdown of the…
The role of the short range magnetic correlations on the gap opening of the topological Kondo insulators
E. Ramos, R. Franco, J. Silva-Valencia +2
In this work we investigate the effects of the short range magnetic correlations on the gap opening of the topological Kondo insulators. We consider an additional narrow band to th…
The atomic approach of the Anderson model for the U finite case: application to a quantum dot
T. Lobo, M. S. Figueira, M. E. Foglio
In the present work we apply the atomic approach to the single impurity Anderson model (SIAM). A general formulation of this approach, that can be applied both to the impurity and…
Green's Functions for the Anderson model: the Atomic Approximation
M. E. Foglio, T. Lobo, M. S. Figueira
We consider the cumulant expansion of the PAM employing the hybridization as perturbation (Phys. Rev. B 50, 17933 (1994)), and we obtain formally exact one-electron Green's functio…
Transport Properties for and Intermediate Valence Model of TlMnO
M. E. Foglio, G. E. Barberis
The appearance of colossal magneto resistance (CM) in TlMnO has stimulated many recent studies of the pyrochlore family of compounds ABO. The do…
Thermodynamic properties of the periodic Anderson model:X-boson treatment
R. Franco, M. S Figueira, M. E Foglio
We study the specific dependence of the periodic Anderson Model (PAM) in the limit of employing the X-boson treatment in two fifferent regimes of the PAM: the heavy ferm…
Theory and experiment of the ESR of Co in Zn % (OH)PO and Mg(OH)AsO
M. E. Foglio, M. C dos Santos, G. E. Barberis +4
Experiments of Electron Spin Resonance (ESR) were performed on Co substituting Zn or Mg in powder samples of Zn(OH)PO and Mg(OH)AsO. The obse…
Thermodynamic potential of the Periodic Anderson Model with the X-boson method: Chain Approximation
R. Franco, M. S. Figueira, M. E. Foglio
The Periodic Anderson Model (PAM) in the limit has been studied in a previous work employing the cumulant expansion with the hybridization as perturbation (M. S. Figue…
X-boson cumulant approach to the periodic Anderson model
R. Franco, M. S. Figueira, M. E. Foglio
The Periodic Anderson Model (PAM) can be studied in the infinite U limit by employing the Hubbard X operators to project out the unwanted states. We have already studied this probl…
The periodic Anderson model from the atomic limit and FeSi
M. E. Foglio, M. S. Figueira
The exact Green's functions of the periodic Anderson model for are formally expressed within the cumulant expansion in terms of an effective cumulant. Here we resort…
The Cumulant Expansion for the Anderson Lattice with Finite U: The Completeness Problem
M. E. Foglio, M. S. Figueira
``Completeness'' (i.e. probability conservation) is not usually satisfied in the cumulant expansion of the Anderson lattice when a reduced state space is employed for $U\to \infty…
Cumulant expansion of the periodic Anderson model in infinite dimension
M. E. Foglio, M. S. Figueira
The diagrammatic cumulant expansion for the periodic Anderson model with infinite Coulomb repulsion () is considered here for an hypercubic lattice of infinite dimension…