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Condensed Matter Colloquium Thursday, March 3, 2011

Summary: Condensed Matter Colloquium
Thursday, March 3, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Egor Babaev
University of Massachusetts, Amherst
"Type-1.5" Superconductivity
In contrast to single-component superconductors, which are described at the
level of Ginzburg-Landau theory by a single Ginzburg-Landau parameter and are
divided into type-I and type-II classes, multi-component systems (in particular
multiband superconductors) in general should possess a separate regime which
falls outside this dichotomy (the term "type-1.5" superconductivity was coined
for it recently). In that state there are thermodynamically stable vortex
excitations which have nonmonotonic interaction as a consequence of the
multicomponent nature of the condensate. Two such vortices attract one
another at long range but repel at shorter ranges. As a consequence the system
should possess an additional phase in magnetic field where vortices form
clusters which coexist with domains of Meissner state. Moreover in the vortex
clusters the interaction forces between N vortices are non-pairwise at
intermediate length scales which strongly affects structure of the cluster. The


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science