Efeito da pressão em supercondutores de Hg-12(n-1)n e efeito Casimir na escala nanométrica.

• Ano de defesa: 2010
• Autor(a) principal: Rodrigues Junior, Valdi Antonio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Física; Centro de Ciências Exatas; UFES; Programa de Pós-Graduação em Física
• Palavras-chave em Português: Superconductivity; Cuprates; Mercury superconductor; Casimir effect; Supercondutividade; Cupratos; Supercondutores de Mercúrio; Efeito Casimir; Física; 53
• Link de acesso: http://repositorio.ufes.br/handle/10/4775

In this work will be presented a description in wich Tc has a pressure-dependent behaviour in Hg-12(n-1)n superconductors, that takes into account the Casimir effect by considering the CuO2 conducting layers to act as plasma sheets. The Casimir energy arises from the parallel plasma sheets (Cu–O planes) whenever these are separated by distances on nanometer scale. The Tc pressure dependence in Hg12(n-1)n superconductors can be described by a pressure-induced charge transfer together with intrinsic terms that are associated with the Casimir energy. For Hg12(n-1)n samples with optimum oxygen content, the charge transfer term vanishes, leaving an explicit expression for the intrinsic term. By picking up realistic parameters and inserting them in the expression for the Tc pressure dependence, we have a good agreement with experimental intrinsic term data observed in the mercury family Hg-12(n-1)n superconductors.