Christopher N. Varney, Karl A. H. Sellin, Qingze Wang, Hans Fangohr, Egor Babaev
We demonstrate the possible formation of hierarchical mesophases of vortex matter in layered superconducting systems where there are variations of interlayer thicknesses and layers are made of different superconducting materials. We show that because inter-vortex forces feature multiple length scales in this case the magnetic response features the formation of mesophases such as clusters of vortex clusters, concentric vortex rings, vortex clusters in a ring, and vortex stripes in a cluster.
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http://arxiv.org/abs/1212.1130
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