The possibility of increasingTc in oxide high-Tc superconductor films: Interaction with elastic fields of defects |
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Authors: | V S Vikhnin |
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Affiliation: | (1) Solid State Optics Department, A. F. Ioffe Physical Technical Institute, Saint Petersburg, Russia |
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Abstract: | The influence onT
c
of dilatation centers (DC) as elastic defects near the surface or in thin films of oxide high-Tc superconductors is considered. The distribution function ofT
c
in this case was obtained. This is the Lorentzian with center shifted to largerT
c
values. The half width of theT
c
distribution n (n is the concentration of DC) is larger than its center shift and corresponds to the increase ofT
c
fluctuations near the surface. As a result, a continuum percolation behavior with increasing critical temperature percolation levelT
(c) near the surface appears. The inequalityn>T
(c)>T
c
initial
is fulfilled. ForT>T
(c) the quasi-2D Josephson media takes place where a finite superconductive domain withT
c
local
>T
(c) exists. The influence of DC considerably increases for strong DC such as off-center impurity ions. |
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Keywords: | Critical temperature superconductor film elastic defects percolation |
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