In-plane Antiferromagnetism in Ferromagnetic Kagome Semimetal Co3Sn2S2
arxiv(2024)
摘要
Co3Sn2S2 has been reported to be a Weyl semimetal with broken time-reversal
symmetry with c axis ferromagnetism (FM) below a Curie temperature of 177 K.
Despite the large interest in Co3Sn2S2, the magnetic structure is still under
debate and recent studies have challenged our understanding of the magnetic
phase diagram of Co3Sn2S2 by reporting unusual magnetic phases including the
presence of exchange bias. Understanding the magnetism of Co3Sn2S2 is important
since its electronic band structure including the much-celebrated flat bands
and Weyl nodes depend on the magnetic phase. In this work, using X-ray Magnetic
Circular Dichroism (XMCD), we establish that the magnetic moment in Co arises
from the spin, with negligible orbital moment. In addition, we detect an
in-plane AFM minority phase in the sea of a FM phase using spatially-resolved
angle-resolved photoemission spectroscopy (μ-ARPES) combined with density
functional theory (DFT) calculation. Separately, we detect a sharp flat band
precisely at the Fermi level (EF) at some regions in the sample, which we
attribute to a surface state. The AFM phase survives even to the low
temperature of 6 K. This example of entirely different magnetic ground states
in a stoichiometric intermetallic invites further efforts to explore the
observed AFM phase and understand the origin and nature of the magnetic and
electronic inhomogeneity on the mesoscale and the interface between the AFM and
FM phases.
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