5 citations · 24 across the 16 of their papers we have counts for
11 papers · 1 filter
Temperature dependence of the magnetic hyperfine field at an s-p impurity diluted in Ni
A. L. de Oliveira, C. M. Chaves, N. A. de Oliveira +1
We study the formation of local magnetic moments and magnetic hyperfine fields at an \textit{s-p} impurity diluted in intermetallic Laves phases compounds Ni ( = Nd, Sm…
Pseudogap and the specific heat of high T superconductors: a Hubbard model in a n-pole approximation
E. J. Calegari, A. C. Lausmann, S. G. Magalhaes +2
In this work the specific heat of a two-dimensional Hubbard model, suitable to discuss high- superconductors (HTSC), is studied taking into account hopping to first () and…
Interplay between condensation energy, pseudogap and the specific heat of a Hubbard model in a n-pole approximation
A. C. Lausmann, E. J. Calegari, S. G. Magalhaes +2
The condensation energy and the specific heat jump of a two-dimensional Hubbard model, suitable to discuss high- superconductors, is studied. In this work, the Hubbard model i…
Specific heat of a non-local attractive Hubbard model
E. J. Calegari, C. O. Lobo, S. G. Magalhaes +2
The specific heat of an attractive (interaction ) non-local Hubbard model is investigated. We use a two-pole approximation which leads to a set of correlation functions. In pa…
Pseudogap and the specific heat of high superconductors
E. J. Calegari, S. G. Magalhaes, C. M. Chaves +1
The specific heat of a two dimensional repulsive Hubbard model with local interaction is investigated. We use the two-pole approximation which exhibits explicitly important correla…
Magnetic moment formation at a dilute Ce(140) impurity in RCo_2 compounds
A. L. de Oliveira, C. M. Chaves, N. A. de Oliveira +1
A great deal of experimental work using perturbed angular correlation (PAC) has succeed in measuring hyperfine fields in Ce diluted in metallic systems, thus allowing the determina…
Superconductivity in an extended Hubbard model with attractive interaction
E. J. Calegari, S. G. Magalhaes, C. M. Chaves +1
In this work, a two-dimensional one-band Hubbard model is investigated within a two-pole approximation. The model presents a non-local attractive potential that allows th…
Effect of hybridization on the magnetic properties of correlated two-band metals
C. M. Chaves, A. Troper
The magnetic properties of transition-like metals are discussed within the single site approximation, which is a picture to take into account electron correlations. The metal is de…
Ferromagnetism in two band metals: Combined effect of Coulomb correlation, hybridization and band widths
C. M. Chaves, A. Troper
We study the possibility of ferromagnetism in metals. The metal is described by two hybridized bands one of which includes Hubbard correlation whereas the other is uncorrelated. We…
Cross effect of Coulomb correlation and hybridization in the occurrence of ferromagnetism in two shifted band transition metals
C. M. Chaves, A. Troper
In this work we discuss the occurrence of ferromagnetism in transition-like metals. The metal is represented by two hybridized() and shifted ) bands one of which includes…
On the use of a single site approximation to describe correlation in pure metals
C. M. Chaves, A. A. Gomes, A. Troper
The magnetic properties of pure transition-like metals are discussed within the single site approximation, to take into account the electron correlation. The metal is described by…