Reinvestigation of Inhomogeneous Superconductors and High $T_{c}$ Superconductors

Details Reinvestigation of Inhomogeneous Superconductors and High $T_{c}$ Superconductors Reinvestigation of Inhomogeneous Superconductors and High $T_{c}$ Superconductors

1998-01-15

arxiv.org/abs/cond-mat/9801150v1

Physics

Condensed Matter

Superconductivity

41 pages, latex, no figures, appeared in the book entitled "Reinvestigation of inhomogeneous superconductors and high $T_{c}$

Scientific paper

We review the recent progress in the theory of inhomogeneous superconductors. It was shown that Gor'kov's self-consistency equation needs a pairing constraint derived from the Anomalous Green's function. The Bogoliubov-de Gennes equations also need a pairing constraint in order to obtain a correct vacuum state by the corresponding unitary transformation. This new study opens up a reinvestigation of inhomogeneous superconductors. We discuss (i) problems of the conventional Green's function theory, (ii) reinvestigation of impure superconductors, and (iii) impurity doping effect in high $T_{c}$ superconductors. It is also pointed out that a new formalism is required to tackle the macroscopically or mesoscopically inhomogeneous systems such as the junction and the vortex problems.

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