Julien Garaud, Karl A. H. Sellin, Juha Jäykkä, Egor Babaev
Rather generically, multicomponent superconductors and superfluids have intercomponent current-current interaction. This applies to wide range of physical systems from mixtures of hadronic superfluids in neutron stars, ultracold atoms to p-wave superconductors. Here we discuss how this kind of interaction affects magnetic response of superconductors. Going beyond the frequently used London limit, we show that in superconductors with substantially strong intercomponent drag interaction, the topological defects which form in external field are Skyrmions. We study their properties and show that they can be distinguished from ordinary vortices by a very characteristic magnetization process.
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http://arxiv.org/abs/1307.3211
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