Phase textures induced by dc current pairbreaking in multilayer structures and two-gap superconductors

Abstract

We predict current-induced formation of equilibrium phase textures for a multicomponent superconducting order parameter. Using the two-component Ginzburg-Landau and Usadel equations, we show that, for weakly coupled co-moving superconducting condensates, dc current I first causes breakdown of the phase locked state at $I>I_{c1}$ followed by the formation of intrinsic phase textures well below the depairing current $I_d$. These phase textures can manifest themselves in multilayer structures, atomic Bose condensate mixtures in optical lattices and two-gap superconductors, particularly MgB${}_2$, where they can result in oscillating and resistive switching effects.

Accepted for publication in PRL

References in corpus (1)

• Vortex Imaging in the pi-Band of Magnesium Diboride

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• Roles of intrinsic anisotropy and pi-band pairbreaking effects on critical currents in tilted c-axis MgB2 films probed by magneto-optical and transport measurements
• Josephson effect in point contacts between two-band superconductors
• Unconventional and anomalous magnetic field distribution in a bilayer superconductor with geometric constraints