Ciencias,UNAM

Browsing Física by Author "Orozco, S"

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Browsing Física by Author "Orozco, S"

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  • 2D and quasi-2D models for Y124 under pressure
    Ortiz, MA; Arredondo, Y; Mendez-Moreno, RM; Orozco, S; Moreno, M (2004)
    Experimentally it is found that the pressure dependence of T-c, in high-T-c superconductors, is influenced by several factors. The carrier density, the doping, and the contraction of the unit cell are some of these factors. ...
  • The charge carrier density effect on the superconductor parameters in a two-band model
    Orozco, S; Mendez-Moreno, RM; Ortiz, MA; Moreno, M (2006)
    The effect of the mobile charge concentration on the electron-phonon coupling constant, the band overlapping parameter and the isotopic coefficient is studied for a two-dimensional superconductor in a two-band model. This ...
  • Compressibility of a two-dimensional electron gas
    Orozco, S; Mendez-Moreno, RM; Moreno, M (2003)
    The ground-state compressibility of the two-dimensional electron gas is determined for the density region which includes the fluid to localized phase transition. The behavior of the chemical potential mu(rho) across the ...
  • Energy band overlapping in high-T-c superconductors
    Moreno, M; MendezMoreno, RM; Ortiz, MA; Orozco, S (1996)
    Multi-band superconductors are analyzed and the relevance of overlapping energy bands to the high-T-c of these materials is studied. Within the BCS framework, a two band model with generalized Fermi surface topologies is ...
  • Influence of the charge concentration on the density of states in a two-dimensional superconducting system
    Orozco, S; Ortiz, MA; Mendez-Moreno, RM; Moreno, M (2007)
    The gap and the density of states of high-T-c superconductors have been a subject of paramount interest. In order to explain the observed experimental behavior several pairing mechanisms in high-temperature superconductivity ...
  • Magnetic character of the deformable jellium
    Ortiz, MA; MendezMoreno, RM; Moreno, M; Orozco, S (1996)
    Ground-state properties for the electron gas, in the deformable jellium, are obtained. Periodic expansions for the state function, with fermion density centered around a cubic lattice, are introduced. The paramagnetic and ...
  • Magnetic character of the two-dimensional electron gas
    Orozco, S; Mendez-Moreno, R; Moreno, M (2001)
    The energies of the paramagnetic and ferromagnetic states of the two-dimensional electron gas are evaluated and compared in order to determine the magnetic character of the ground state. The calculations are made with the ...
  • A model for high-T-c superconductors with energy-band overlapping
    Ortiz, MA; Mendez-Moreno, RM; Orozco, S; Moreno, M (2002)
    The correlation between pressure and the critical temperature of high-T-c superconductors is studied. The specific case of the Hg cuprates is considered in detail. In a simple model in which overlapping of bands increases ...
  • A model for the isotope effect in high-T-c superconductors
    Orozco, S; Ortiz, MA; Mendez-Moreno, RM; Moreno, M (2004)
    In this work the isotope coefficient is calculated from the BCS gap equation, using a model with anomalous occupation in the momentum space. The specific case of cuprate oxide superconductors is considered in detail. The ...
  • Properties of the two-dimensional electron gas
    Orozco, S; Mendez-Moreno, RM; Moreno, M (1999)
    Ground stare properties of the two-dimensional electron gas are studied in the deformable jellium model. The calculations are made within the self-consistent Hartree-Fock approximation. The phase transition from plane wave ...
  • The self-consistent ground state of the two-dimensional electron gas
    Moreno, M; Mendez-Moreno, RM; Orozco, S (1998)
    The self-consistent Hartree-Fock approximation and the deformable jellium model are used to describe the ground state of the two-dimensional electron gas. Improved precision in the calculations allows us to confirm the ...
  • SUPERCONDUCTIVITY IN A NEW SUPERSYMMETRIC SCHEME
    Moreno, M; Mendez-Moreno, RM; Orozco, S; Ortiz, MA; Dellano, M (1995)
    A new pairing theory for many-fermion systems is obtained via a framework related to the one recently introduced to describe Dirac particles in external potentials. It is shown that the standard Bogoliubov-Valatin canonical ...
  • Three-dimensional electron gas with localization along one, two, and three directions
    Mendez-Moreno, RM; Ortiz, MA; Orozco, S; Moreno, M (2002)
    A powerful non-perturbative technique, which allows a direct evaluation of the ground state properties of an interacting electron gas in three dimensions, has been developed. In a unified approach, the low-, intermediate-, ...

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