Navegação Ciências Exatas e da Terra por Autor "Coqblin, Bernard"

Resultados 1-8 de 8

    • Application of the underscreened Kondo lattice model to neptunium compounds 

      Thomas, Christopher; Simões, Acirete Souza da Rosa; Iglesias, Jose Roberto; Lacroix, Claudine; Coqblin, Bernard (2012) [Artigo de periódico]
      The coexistence of Kondo e®ect and ferromagnetic order has been observed in many uranium and neptunium compounds such as UTe or Np2PdGa3. This coexistence can be described within the underscreened Anderson lattice model ...

    • Band-filling effects on Kondo-lattice properties 

      Coqblin, Bernard; Lacroix, Claudine; Gusmao, Miguel Angelo Cavalheiro; Iglesias, Jose Roberto (2003) [Artigo de periódico]
      We present theoretical results for a Kondo-lattice model with spin-1/2 localized moments, including both the intrasite Kondo coupling and an intersite antiferromagnetic exchange interaction, treated within an extended ...

    • Phase diagram for the Anderson lattice model 

      Bernhard, Ben Hur; Lacroix, Claudine; Iglesias, Jose Roberto; Coqblin, Bernard (2000) [Artigo de periódico]
      We study the competition between the Kondo effect and the Ruderman-Kittel-Kasuya-Yosida interaction in the framework of the Anderson lattice model with an extra intersite exchange term. By using an approximation based on ...

    • Quantum critical point in the spin glass-Kondo transition in heavy-fermion systems 

      Theumann, Alba Graciela Rivas de; Coqblin, Bernard (2004) [Artigo de periódico]
      The Kondo–spin glass competition is studied in a theoretical model of a Kondo lattice with an intrasite Kondo-type exchange interaction treated within the mean-field approximation, an intersite quantum Ising exchange ...

    • Revisited doniach diagram : influence of short-range antiferromagnetic correlations in the Kondo lattice 

      Iglesias, Jose Roberto; Lacroix, Claudine; Coqblin, Bernard (1997) [Artigo de periódico]
      The Kondo lattice model including nearest-neighbor magnetic exchange interactions is studied here in a mean-field approximation describing both the Kondo state and the intersite magnetic correlations. In the case of ...

    • Spin-glass freezing in Kondo-lattice compounds 

      Theumann, Alba Graciela Rivas de; Coqblin, Bernard; Magalhaes, Sergio Garcia; Schmidt, Alex Andre (2001) [Artigo de periódico]
      A theory is presented that describes a spin-glass phase at finite temperatures in Kondo-lattice systems with an additional Ruderman–Kittel–Kasuya–Yosida interaction represented by long range, random couplings among localized ...

    • The S=1 underscreened anderson lattice model for uranium compounds 

      Thomas, Christopher; Simões, Acirete Souza da Rosa; Iglesias, Jose Roberto; Lacroix, Claudine; Perkins, Natalia B.; Coqblin, Bernard (2011) [Artigo de periódico]
      Magnetic properties of uranium and neptunium compounds showing coexistence of the Kondo e®ect and ferromagnetic order are investigated within the degenerate Anderson Lattice Hamiltonian, describing a 5f2 electronic ...

    • Underscreened Kondo lattice model applied to heavy fermion uranium compounds 

      Perkins, Natalia B.; Núñez-Regueiro, M.D.; Coqblin, Bernard; Iglesias, Jose Roberto (2007) [Artigo de periódico]
      We present theoretical results for the underscreened Kondo lattice model with localized S=1 spins coupled to a conduction band through a Kondo coupling, JK, and interacting among them ferromagnetically. We use a fermionic ...