Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe

2011/01/04 by H. Wilhelm, M. Baenitz, M. Schmidt +3 · 1 citation
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.107.127203

published as Phys. Rev. Lett. 107, 127203 (2011) · 5 pages, 4 figures

arxiv created 2011/01/04 · arxiv updated 2011/11/10

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 +π Skyrmion lattice, the adjacent A₂ pocket, however, appears to be related to helicoids propagating in directions perpendicular to the applied field.

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