6 papers
Superconductivity in the Kondo lattice: a mean-field approach
M. A. Gusmao, A. A. Aligia
We calculate the superconducting critical temperature T_c and the Kondo temperature T_K of the Kondo lattice, decoupling the Kondo exchange interaction in the unrestricted Hartree-…
Metamagnetism in one dimensional systems with edge sharing CuO polihedra
A. A. Aligia
We study a Heisenberg chain with nearest-neighbor (NN) J1 and next-NN J2 exchange interactions with anisotropies Delta_1 and Delta_2 respectively. We investigate by analytical and…
Superconductivity and Topological Numbers in the Hubbard Chain with Bond-Charge Interaction
A. A. Aligia, K. Hallberg, C. D. Batista +1
We determine the quantum phase diagram of the Hubbard chain with electron-hole symmetric correlated hopping at 1/2- and 1/4-filling using geometric concepts and continuum limit fie…
Exact Solution of a Hubbard Chain with Bond-Charge Interaction
A. A. Aligia, L. Arrachea
We obtain the exact solution of a general Hubbard chain with kinetic energy , bond-charge interaction and on-site interaction with the only restriction . At zero…
Superconductivity in the cuprates
C. D. Batista, A. A. Aligia
We evaluate numerically several superconducting correlation functions in a generalized model derived for hole-doped CuO planes. The model includes a three-site term …
Impurity systems fluctuating between two magnetic configurations: candidates for non Fermi-liquid behavior
A. A. Aligia, M. Balina
The appropriate generalization of the isotropic impurity Anderson model for valence fluctuations between two magnetic multiplets and is solved in the strong-couplin…