Type-1.5 Superconducting State from an Intrinsic Proximity Effect in Two-Band Superconductors

Abstract

We show that in multiband superconductors even small interband proximity effect can lead to a qualitative change in the interaction potential between superconducting vortices by producing long-range intervortex attraction. This type of vortex interaction results in unusual response to low magnetic fields leading to phase separation into domains of a two-component Meissner states and vortex droplets.

Replaced with published version. Typos in the table of parameters in Fig. 4 are corrected

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