Magnetic Skyrmion lattices in heavy fermion superconductor UPt3

Abstract

Topological analysis of nearly SO(3)(spin) symmetric Ginzburg-Landau theory, proposed for UPt3 by Machida ct 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 corelike Abrikosov vortices and at low magnetic fields they become lighter fur strongly type-II superconductors. Magnetic Skyrmions repel each other as 1/r at distances much larger than 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. [S0031-9007(98)08317-3].