Type-1.5 superconductivity in muliband and other multicomponent systems

Abstract

Usual superconductors are classified into two categories as follows: type-1 when the ratio of the magnetic field penetration length (λ) to coherence length (ξ) with Ginzburg-Landau parameter κ=λ/ξ<1/\sqrt{2} and type-2 when κ>1/\sqrt{2}. The boundary case κ=1/\sqrt{2} is also considered to be a special situation, frequently termed as "Bogomolnyi limit". Here we discuss multicomponent systems which can possess three or more fundamental length scales and allow a separate superconducting state, which was recently termed "type-1.5". In that state a system has the following hierarchy of coherence and penetration lengths ξ_1<\sqrt{2}λ<ξ_2. We also briefly overview the works on single-component regime $\kappa \approx 1/\sqrt{2}$ and comment on recent discussion by Brandt and Das in the proceedings of the previous conference in this series.

Contribution to proceedings of the International Conference on Superconductivity and Magnetism 2012. v2: published version

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