Onset of superconductivity in a voltage-biased normal-superconducting-normal microbridge
Author(s)Serbyn, Maksym; Skvortsov, Mikhail A.
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We study the stability of the normal state in a mesoscopic NSN junction biased by a constant voltage V with respect to the formation of the superconducting order. Using the linearized time-dependent Ginzburg-Landau equation, we obtain the temperature dependence of the instability line, V[subscript inst] (T), where nucleation of superconductivity takes place. For sufficiently low biases, a stationary symmetric superconducting state emerges below the instability line. For higher biases, the normal phase is destroyed by the formation of a nonstationary bimodal state with two superconducting nuclei localized near the opposite terminals. The low-temperature and large-voltage behavior of the instability line is highly sensitive to the details of the inelastic relaxation mechanism in the wire. Therefore, experimental studies of V[subscript inst] (T) in NSN junctions may be used as an effective tool to access the parameters of the inelastic relaxation in the normal state.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review B
American Physical Society
Serbyn, Maksym, and Mikhail A. Skvortsov. “Onset of Superconductivity in a Voltage-Biased Normal-Superconducting-Normal Microbridge.” Phys. Rev. B 87, no. 2 (January 2013). © 2013 American Physical Society
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