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VOLUME 55 (1992) | ISSUE 1 | PAGE 66
Stimulation of superconductivity by a quasiparticle current in a multilayer superconducting tunnel structure
A two-barrier tunnel structure of the type Sh ISISh, in which the superconductors 5(Λ) differ substantially in (equilibrium) transition temperature (Тл <^7^),is analyzed. The gap Δ in S is found as a function of the voltage across the structure, V. Several results are found: (1) AteF<2(AA + Δ0), the gap may grow to values on the order of the equilibrium value Δ0 ~ Гл. (2) At T> , the solution for Δ is a double-valued function of Vand T. (3) At e V< 2 (Ah — Δ0), three phase transition may occur as Tis lowered, at temperatures Tcl > Tc2 > Tc3. Since the solution is multivalued, there are structural features on plots of the quasiparticle component and the Josephson component of the current versus Fand on T.