522 citations · 2.8k across the 140 of their papers we have counts for
6 papers · 1 filter
Double exchange model for RuSr_2(Eu,Gd)Cu_2O_8
H. Aliaga, A. A. Aligia
We propose a double exchange model to describe the RuO_2 planes of RuSr_2(Eu,Gd)Cu_2O_8. The Ru^+5 ions are described by localized spins, and additional electrons provided by the s…
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…
Anomalous flux quantization in a Hubbard ring with correlated hopping
Liliana Arrachea, A. A. Aligia, E. Gagliano
We solve exactly a generalized Hubbard ring with twisted boundary conditions. The magnitude of the nearest-neighbor hopping depends on the occupations of the sites involved and the…
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…