Egor Babaev, Mihail Silaev
Usual superconductors are classified into two categories as follows: type-1 when the ratio of the magnetic field penetration length ($\lambda$) to coherence length ($\xi$) $ \kappa=\lambda/\xi <1/\sqrt{2}$ and type-2 when $\kappa >1/\sqrt{2}$. The boundary case $\kappa =1/\sqrt{2}$ is also considered as 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 $\xi_1<\sqrt{2}\lambda<\xi_2$. We also briefly overview the works on single-component regime $\kappa \approx 1/\sqrt{2}$ and make some remarks on recent discussion of it by Brandt and Das in the proceedings of the previous conference in this series.
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http://arxiv.org/abs/1206.6786
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