THE VORTEX STRUCTURE AND THE ANISOTROPY OF THE PENETRATION DEPTH IN SUPERCONDUCTING MULTILAYERS - THE VORTEX PARALLEL TO THE LAYERS

The structure of the vortex and the anisotropy of the penetration dept h, lambda, in a superlattice compound of nonequivalent superconducting layers (S(i)) and isolating layers (I(i)) with the field parallel to the layers has been studied theoretically. A simple vortex solution ha s been found for the thin layered structure. Our particular interest c oncerned the case when one of the layers is a normal metal (N) whose s uperconducting properties are induced via the proximity effect with th e S layers. Our approach was based on solving the Ginzburg-Landau equa tions with boundary conditions applicable for real structures. It is s hown that the anisotropy ratio alpha = lambda(parallel-to)/lambda(perp endicular-to) for S/N multilayers is temperature dependent and may eit her increase or decrease with decreasing temperature.