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Skyrmionic State And Stable Half-Quantum Vortices In Chiral P-Wave Superconductors, Julien Garaud, Egor Babaev
Skyrmionic State And Stable Half-Quantum Vortices In Chiral P-Wave Superconductors, Julien Garaud, Egor Babaev
Egor Babaev
Observability of half-quantum vortices and skyrmions in p-wave superconductors is an outstanding open question. Under the most common conditions, fractional flux vortices are not thermodynamically stable in bulk samples. Here we show that in chiral p-wave superconductors, there is a regime where, in contrast lattices of integer flux vortices are not thermodynamically stable. Instead skyrmions made of spatially separated half-quantum vortices are the topological defects produced by an applied external field.
Vortex Coalescence And Type-1.5 Superconductivity In Sr2ruo4, Egor Babaev
Vortex Coalescence And Type-1.5 Superconductivity In Sr2ruo4, Egor Babaev
Egor Babaev
Recently vortex coalescence was reported in superconducting Sr2RuO4 by several experimental groups for fields applied along the c axis. We argue that Sr2RuO4 is a type-1.5 superconductor with long-range attractive, short-range repulsive intervortex interaction. The type-1.5 behavior stems from an interplay of the two orbital degrees of freedom describing this chiral superconductor together with the multiband nature of the superconductivity. These multiple degrees of freedom give rise to multiple coherence lengths, some larger and some smaller than the magnetic field penetration length, resulting in nonmonotonic intervortex forces.