Magnetic skyrmions and their lattices in triplet superconductors
A. Knigavko, B. Rosenstein, Y. F. Chen
DOI 10.1103/PhysRevB.60.550 · Physical Review B
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Abstract
A complete topological classification of solutions in SO(3) symmetric Ginzburg-Landau free energy has been performed and a new class of solutions in weak external magnetic field carrying two units of magnetic flux has been identified. These solutions, magnetic skyrmions, do not have a singular core as Abrikosov vortices do and at low magnetic field they become lighter for strongly type II superconductors. As a consequence, the lower critical magnetic field Hc1 is reduced by a factor of lnκ. Magnetic skyrmions repel each other as 1/r at distances much larger than magnetic penetration depth λ forming a relatively robust triangular lattice. Magnetization near Hc1 increases gradually as (H−Hc1)2. This behavior agrees very well with experiments on heavy fermion superconductor UPt3. Newly discovered Ru based compounds Sr2RuO4 and Sr2YRu1−xCuxO6 are other possible candidates to possess skyrmion lattices. Deviations from exact SO(3) symmetry are also studied.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.45 | Pressure not reported | unknown |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sr2YRu1-xCuxO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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