Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Foglio, M. E."'
Publikováno v:
Physics Letters A 358 (2006) 313-321
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 slave-boson at intermediate temperatures when the total occupation num
Externí odkaz:
http://arxiv.org/abs/2010.00444
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 the otherwise completely localized f-electrons, by adding a term to the
Externí odkaz:
http://arxiv.org/abs/1604.00422
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 to the lattice Anderson Hamiltonian, was developed in a previous work
Externí odkaz:
http://arxiv.org/abs/0911.4466
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 functions (GF). These GF contain effective cumulants that are as difficult to
Externí odkaz:
http://arxiv.org/abs/0903.0139
Autor:
Foglio, M. E., Barberis, G. E.
The appearance of colossal magneto resistance (CM) in Tl$_{2}$Mn$_{2}$O$_{7}$ has stimulated many recent studies of the pyrochlore family of compounds A$_{2}$B$_{2}$O$_{7}$. The double exchange (DE) model of Zener does not describe the CM in Tl$_{2}$
Externí odkaz:
http://arxiv.org/abs/cond-mat/0410163
We study the specific dependence of the periodic Anderson Model (PAM) in the limit of $U=\infty$ employing the X-boson treatment in two fifferent regimes of the PAM: the heavy fermion Kondo (HF-K) and the heavy fermion local magnetic regime (HF-LMM).
Externí odkaz:
http://arxiv.org/abs/cond-mat/0301438
Autor:
Foglio, M. E., Santos, M. C dos, Barberis, G. E., Rojo, J. M., Mesa, J. L., Lezama, L., Rojo, T.
Experiments of Electron Spin Resonance (ESR) were performed on Co$% ^{2+}$ substituting Zn$^{2+}$ or Mg$^{2+}$ in powder samples of Zn$_2$(OH)PO$_4$ and Mg$_2$(OH)AsO$_4$. The observed resonances are described with a theoretical model that considers
Externí odkaz:
http://arxiv.org/abs/cond-mat/0110563
The Periodic Anderson Model (PAM) in the $U\to\infty$ limit has been studied in a previous work employing the cumulant expansion with the hybridization as perturbation (M. S. Figueira, M. E. Foglio and G. G. Martinez, Phys. Rev. B \textbf{50}, 17933
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109532
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 problem employing the cumulant expansion with the hybridization as perturba
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109037
Autor:
Foglio, M. E., Figueira, M. S.
The exact Green's functions of the periodic Anderson model for $U\to \infty $ are formally expressed within the cumulant expansion in terms of an effective cumulant. Here we resort to a calculation in which this quantity is approximated by the value
Externí odkaz:
http://arxiv.org/abs/cond-mat/9909036