Parameter symmetry in ferromagnetic superconductors / Simetria do parametro de ordem em supercondutores ferromagneticos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In this dissertation, we present a study of the order-parameter symmetry in ferromagnetic superconductors. Our approach is inspired on the Landau Theory of Phase Trasition or, more precisely, on the idea that a second order phase transition is a symmetry breaking process where the ordered phase of the system is described by a subgroup of the highly symmetric one, leading to important consequences for the order parameter. In our case, it imposes constraints to the superconducting gap structure. The recent discovery of the coexistence of superconductivity and ferromagnetism brought the problem of the classification of such structures in the situation where time reversal symmetry is broken on the normal state. We argue that this problem is solved when one consider the description of such normal state by magnetic groups (or cogroups) and that the classification of the superconducting states must be done in terms of the corepresentations of such cogroups

ASSUNTO(S)

supercondutividade superconductivity phase coexistence phenomenological theory ferromagnetismo teoria fenomenologica symmetry (physics) coexistencia de fases ferromagnetism simetria (fisica)

ACESSO AO ARTIGO

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