Abstract:
Ferromagnetism and superconductivity had been thought to be mutually exclusive.
Even when
superconductivity has been thought as arising from magnetic mediation of
paired
'electrons, it was believed that superconductivity occurs in the paramagnetic
phase. A great effort has been made to prove this. In 2000 the two phenomena
were found
to coexist in UGe2, URhG
and ZrZn2 in which the same electrons are
responsible for
both phenomenon.
e
Superconductivity and ferromagnetic orders are two basic properties of solid state
materials which have been studied intensively for many years. Magnetism is by now
well
understood and the basic mechanisms have been investigated. Superconductiv
ity on
the other hand is not yet well understood. Some of the basic features were
explained in
the fifties by Ginzburg and Landau, by Bardeen, Cooper and Schrieffer.
However,
the basic mechanism of superconductivity in High-T
materials is a mystery
yet awaiting a solution.
The interplay between superconductivity and magnetism is
studied not only because they are competing states, but also because they resolve a
fundamental problem in
the physics of superconductivity.
c
In this study, I
attempted to investigate theoretically the coexistence of supercon
ductivity and ferromagnetism in UNi
2
Al
3
.
keywords: Green's function coexistence,superconductivity, ferromagnetism, critical
temperature.
