Abstract
We consider the time-dependent Ginzburg–Landau model of superconductivity in the presence of an electric current flowing through a two-dimensional wire. We show that when the current is sufficiently strong the solution converges in the long-time limit to the normal state. We provide two types of upper bounds for the critical current where such global stability is achieved: by using the principal eigenvalue of the magnetic Laplacian associated with the normal magnetic field, and through the norm of the resolvent of the linearized steady-state operator. In the latter case we estimate the resolvent norm in large domains by the norms of approximate operators defined on the plane and the half-plane. We also obtain a lower bound, in large domains, for the above critical current by obtaining the current for which the normal state looses its local stability.
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Almog, Y., Helffer, B. Global Stability of the Normal State of Superconductors in the Presence of a Strong Electric Current. Commun. Math. Phys. 330, 1021–1094 (2014). https://doi.org/10.1007/s00220-014-1970-8
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DOI: https://doi.org/10.1007/s00220-014-1970-8