Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe

Abstract

We report on detailed magnetic measurements on the cubic helimagnet FeGe in external magnetic fields and temperatures near the onset of long-range magnetic order at $T_C=278.2(3)$ K. Precursor phenomena display a complex succession of temperature-driven crossovers and phase transitions in the vicinity of $T_C$. The A-phase region, present below $T_C$ and fields $H<0.5$ kOe, is split in several pockets. Relying on a modified phenomenological theory for chiral magnets, the main part of the A-phase could indicate the existence of a $+\pi$ Skyrmion lattice, the adjacent A${}_2$ pocket, however, appears to be related to helicoids propagating in directions perpendicular to the applied field.

5 pages, 4 figures

References in corpus (5)

• Skyrmion Lattice in a Chiral Magnet
• Spontaneous Skyrmion Ground States in Magnetic Metals
• Chiral Skyrmionic matter in non-centrosymmetric magnets
• Metallic State in Cubic FeGe beyond its Quantum Phase Transition
• Structural investigations on $\epsilon$-FeGe at high pressure and low temperature

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