Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tuning Magnetic Order in the van der Waals Metal Fe5GeTe2 by Cobalt
  Substitution   Fe5-xGeTe2 is a van der Waals material with one of the highest reported bulk
Curie temperatures, $T_C$ ~ 310K. In this study, theoretical calculations and
experiments are utilized to demonstrate that the magnetic ground state is
highly sensitive to local atomic arrangements and the interlayer stacking.
Cobalt substitution is found to be an effective way to manipulate the magnetic
properties while also increasing the ordering temperature. In particular,
cobalt substitution up to 30% enhances $T_C$ and changes the magnetic
anisotropy, while approximately 50% cobalt substitution yields an
antiferromagnetic state. Single crystal x-ray diffraction evidences a
structural change upon increasing the cobalt concentration, with a rhombohedral
cell observed in the parent material and a primitive cell observed for ~46%
cobalt content relative to iron. First principles calculations demonstrate that
it is a combination of high cobalt content and the concomitant change to
primitive layer stacking that produces antiferromagnetic order. These results
illustrate the sensitivity of magnetism in Fe5-xGeTe2 to composition and
structure, and emphasize the important role of structural order/disorder and
layer stacking in cleavable magnetic materials.

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The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
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The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: math
26
The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg