Observation of skyrmion-like magnetism in magnetic Weyl semimetal Co3Sn2S2. (March 2020) - Wu, H.C.
Abstract: Polycrystalline samples Co3 Sn2 S2+x (0 ≤ x ≤ 0.34), (Co1-y Niy )3 Sn2 S2.26 (0 ≤ y ≤ 0.05), and (Co1-z Fez )3 Sn2 S2.26 (0 ≤ z ≤ 0.05) were synthesized using a solid-state-reaction method and characterized by X-ray diffraction, electron probe microanalyzer, and magnetic measurements. Single crystal Co3 Sn2 S2 was also grown by self-flux method and analyzed by detailed magnetic measurements to study its isotropic nature. In this study, we reproduced the low magnetic field anomalous magnetism, as previously reported, with a negligible sample-dependent effect. Furthermore, based on ac magnetic susceptibility data, we established a H- T phase diagram including the skyrmion-like A phase of Co3 Sn2 S2 . Both application of external high-pressure and chemical substitutions revealed anomalous magnetisms in low magnetic fields. The possible origin of the field-induced A phase can be the non-collinear skyrmion-like phenomenon. These interesting findings in Weyl semimetal Co3 Sn2 S2 provide a new candidate in spin-frustrated systems to explore the complexity of magnetic field–induced magnetism. Graphical abstract: Image 1 Highlights: Observations of the robustness of the low-field skyrmion-like A phase in kagome Co3 Sn2 S2 . With high pressure and chemical substitution, the significant evolution of magnetic H- T phase diagram is well-established. These findings provide a new candidate to explore the complexity of magnetic field–induced magnetism.