Bulk Y3/4Lu1/4Ba2Cu3O7 + Cu1-xLixO
composites with x = 0,0.003 and 0.06 and varied volume
content of Cu1-xLixO have been prepared.
Analysis of the transport properties of the composites has
shown that they can be represented as a network of
superconductor-semiconductor-superconductor
(S-Sm-S) weak links. The dependence of the critical current density on the normal
resistance for the composites studied shows a behaviour similar to that for
single Josephson junctions. The experimental
temperature dependences of the critical current are
qualitatively described in terms of a theory of
S-Sm-S junctions that takes into account the Andreev
reflection of carriers from the S-Sm and Sm-S interfaces.
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