Magnetic and magneto-transport studies of two-dimensional ferromagnetic compound Fe 3 GeTe 2 .

We have systematically reported the magnetic and magneto-transport properties of two-dimensional itinerant ferromagnetic compound Fe3GeTe2 at high magnetic fields of 58 T and demonstrated the correlation between its transport and magnetism. Anomalous two-steps magnetic ordering and antiferromagnetic-like transitions in zero field-cooling (ZFC) curves for H // ab-plane are observed. Additionally, we find that intrinsic negative magnetoresistances in bulk Fe3GeTe2 single crystal is mainly attributed to the suppression of spin-fluctuations in low magnetic fields. Complex evolution of temperature dependent high field magnetoresistances are detected under different magnetic field and current configurations, which can be explained as a result of the competition between spin-fluctuation, the magnon-scatterings and classical cyclotronic effects.