Filmes finos supercondutores de alta temperatura crítica

Abstract

The recent discoveries of new superconductors materials have attracted huge interest, not only by their technological potential, but also by their contributing to the understanding of basic mechanisms responsible by the superconductivity phenomenon can bring to the field of the basic physics. One way to study the behavior of superconductors is through the growth of these materials in the shape of thin films. Particularly, the sputtering technique allows these films growth. In this work was carried out a theoretical review about the fundamental concepts of the theories that describe the superconductivity phenomenon to, in a second moment, rich the understand of the characteristics of High Critical Temperature Superconductors (HTS’s), especially the cuprates like ReBa 2 Cu 3 O 7−x (Re = rare earth). Once known the theory, we have looked for, at the literature, the parameters involved in the growth of these compounds in the thin films shape by the technique of sputtering, seeking the largest possible amount of alternative solutions to the this type of deposition characteristic problems, like substrate resputtering by high energy particles and the influence of target properties. The first step to the knowledge of the technique was performed through the production of the YBa 2 Cu 3 O 7−x stoichiometric target in bulk form. The results of X-ray diffraction analysis obtained in the produced targets show that the reaction in solid state is adequated to the YBa 2 Cu 3 O 7−x targets production. Finally, we purpose the problems to be solved as a work sequence in order to rich the full understanding of the technique and make possible the growth of HTS’s thin films with the equipment available at the Laboratório de Magnetismo e Materiais Magnéticos.