• Envelope and waveguide methods : a comparative study of PbF2 and CeO2 birefringent films 

      Horowitz, Flavio; Mendes, Sergio Brito (1994) [Artigo de periódico]
      We have characterized low-birefringence, PbF2 coatings to permit, first, agreement between envelope and prism-coupler waveguide methods under the standard isotropic assumption. In essentially the same measurement conditions, ...
    • 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 ...