Abstract
Abstract Direct observation of the flux distribution on the end faces of inhomogeneous Pb-2 at. % In discs at 4·2°k, in a transverse field cycled from 0 to 550 oe to 165 oe, showed intermediate state structures in regions of low indium concentration, and a triangular flux lattice in regions of high indium concentration. The normal regions of the intermediate state, however, consisted of flux lines arranged either as laminae or as bundles. In spite of the compositional inhomogeneities it was estimated that the indium concentration in every region of the specimens was in excess of that required for type II superconductivity. It is proposed that at 550 oe a flux lattice exists in every region of the specimen and that as the field is reduced the flux lattice breaks down into intermediate state structures first in regions of low indium content and last in regions of high nidium content.
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