Bulg. J. Phys. vol.24 no.1-2 (1997), pp. 063-073
Periodic Bound States of the Magnetic Flux in Josephson Lattices of Resistive Inhomogeneities
N. Alexeeva1, T. Boyadjiev2
1Department of Applied Mathematics. University of Cape Town, 7700 Rondebosch; Western Cape, South Africa
2Faculty of Mathematics and lnformatics, University of Sofia, 5 James Bourchier Blvd, 1164 Sofia, Bulgaria
go back1Department of Applied Mathematics. University of Cape Town, 7700 Rondebosch; Western Cape, South Africa
2Faculty of Mathematics and lnformatics, University of Sofia, 5 James Bourchier Blvd, 1164 Sofia, Bulgaria
Abstract. We consider a model of a long Josephson junction where the thickness of the dielectric layer represents a lattice of resistive inhomogeneities. In the original formulation of this model the inhomogeneities were modeled by Dirac's 8-functions [1-4]. In this paper we study a junction with a finite size of inhomogeneities. Mathematically, the model reduces to the stationary inhomogeneous sine-Gordon equation — ϕxx + jD(x)sinϕ + γ = 0, with given periodic function jD(x) and periodic boundary conditions. We demonstrate numerically, the existence of stable stationary states with spatial period greater than a certain value. Our numerical calculations are based on the continuous analog of the Newton's method.

