Stationary Josephson effect
in superconducting mesoscopic multilayers with tunnel ferromagnetic
barriers
S.V.Naydenov, A.V.Naduev*, S.V.Kuplevakhsky*
Institute for Single Crystals, National Academy of Sciences
of Ukraine, 60 Lenin Ave., 310001 Kharkiv, Ukraine
*Kharkiv State University, Physical Department, 4 Svobody Sq., 310077 Kharkiv, Ukraine
Received April 28, 1998
The problem of stationary Josephson effect in pure superconducting
multilayers with tunnel ferromagnetic barriers near the volume critical
temperature has been studied in the frame of microscopic theory. Expressions
are obtained for the supercurrent at arbitrary superconducting layer
thickness a. A sharp deviation of the superlattice properties
from the single junction ones has been revealed in the limit of small
a values as compared to the coherence length xi0.
In this mesoscopic limit, a<<xi0, effects
of strong supercurrent suppression, ordering parameter decrease and
the exponential renormalization of the Josephson transition critical
temperature are determined. The latter is due to the supercurrent
running as well as to the Cooper pairs destruction resulting from
the exchange interaction in the ferromagnetic barrier region.
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