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Phys Rev Lett. 2010 Aug 6;105(6):067003. Epub 2010 Aug 5.

Type-1.5 superconducting state from an intrinsic proximity effect in two-band superconductors.

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1
Department of Theoretical Physics, The Royal Institute of Technology, Stockholm, SE-10691 Sweden.

Abstract

We show that in multiband superconductors, even an extremely 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 an unusual response to low magnetic fields leading to phase separation into domains of two-component Meissner states and vortex droplets.

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