PERCOLATION IN COMPOSITE FILMS OF BISMUTH AND VANADIUM WITH NS BOUNDARIES

Percolation properties of partially crystallized amorphous Bi and V th in films obtained by a low temperature condensation are investigated. In such amorphous films there is a coexistence of superconducting (S) and normal (N) phases at a certain temperature and the eir concentrati on ratio may be arbitrarily changed. Experimental values of the percol ation threshold p(c) and the critical exponents in the expression for conductivity sigma of the SN composite sigma proportional to (p(c) - p )(-S) given by the percolation theory are in a good agreement with the oretical predictions of two-dimensional <<Swiss cheese>> and <<inverse Swiss cheese>> models.