Bulg. J. Phys. vol.25 no.3-4 (1998), pp. 150-160

Rough Superconducting — Normal Interfaces and the Josephson Effect: A Modified Ginzburg-Landau Type Theory

Z.D. Genchev
Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd, 1784 Sofia, Bulgaria
Abstract. A linear analysis of the modified Ginzburg-Landau equation for a SNS (superconducting/normal/superconducting) junction with two rough boundaries is presented. An integral equation for the spatial variation of the complex-valued order parameter (the wave function) is formulated and solved to the first order of the surface fluctuational heights. The influence of the surface roughness on the current-phase relation and the structural fluctuations of the critical Josephson current density are investigated analytically.

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