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Johannes Reim: Skyrmion-lattice-like spin structure in antiferromagnetic CaBaCo2Fe2O7

Wanneer:di 16-12-2014 14:00 - 15:00
Waar:5115.0013

Abstract

Despite the strong geometric frustration, CaBaCo2Fe2O7 displays a 3D long range magnetic order below TN = 160 K, which can be described by a Heisenberg nearest-neighbor model. At low temperatures a splitting of the magnetic peaks, τ = 0.016 Å-1, has been found using high-resolution neutron diffraction. The corresponding long-period order appears to be induced by DM interaction exploiting the freedom provided by frustration. The observed scattering can be modelled qualitatively with an antiferromagnetic Skyrmion lattice.