Inhomogeneous state in non-equilibrium superconductor/normal metal tunnel structures: a LOFF-like phase for non-magnetic systems
Moor, A. · Volkov, A. F. · Efetov, K. B.
Original · EN
We analyze non-equilibrium states in a tunnel superconductor-normal metal (NSN) structure in the presence of a tunnel current I. We use an approximation of an effective temperature T and calculate the current-voltage I-V characteristics. It is shown that the I-V dependence may have an S-shaped form. We determine nonuniform current I(x) and temperature T(x) distributions that arise as a result of instability of the uniform state with negative differential conductance (dI/dV<0). We discuss an analogy with equilibrium superconductors with an exchange field in which nonuniform states predicted by Larkin-Ovchinnikov and Fulde-Ferrel are possible.
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