Magnetic skyrmion lattices in heavy fermion superconductor UPt3

Details Magnetic skyrmion lattices in heavy fermion superconductor UPt3 Magnetic skyrmion lattices in heavy fermion superconductor UPt3

1998-12-31

arxiv.org/abs/cond-mat/9812435v2

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures, 2 column format; v2:misprint in the title is corrected

Scientific paper

10.1103/PhysRevLett.82.1261

Topological analysis of nearly SO(3)_{spin} symmetric Ginzburg--Landau theory, proposed for UPt$_{3}$ by Machida et al, shows that there exists a new class of solutions carrying two units of magnetic flux: the magnetic skyrmion. These solutions do not have singular core like Abrikosov vortices and at low magnetic fields they become lighter for strongly type II superconductors. Magnetic skyrmions repel each other as $1/r$ at distances much larger then the magnetic penetration depth $\lambda$, forming a relatively robust triangular lattice. The magnetic induction near $H_{c1}$ is found to increase as $(H-H_{c1})^{2}$. This behavior agrees well with experiments.

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