Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe

Details Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe

2011-01-04

arxiv.org/abs/1101.0674v1

Phys. Rev. Lett. 107, 127203 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.127203

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.

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