Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bulk properties of van-der-Waals hard ferromagnet VI3   We present comprehensive measurements of the structural, magnetic and
electronic properties of layered van-der-Waals ferromagnet VI$_3$ down to low
temperatures. Despite belonging to a well studied family of transition metal
trihalides, this material has received very little attention. We outline, from
high-resolution powder x-ray diffraction measurements, a corrected
room-temperature crystal structure to that previously proposed and uncover a
structural transition at 79 K, also seen in the heat capacity. Magnetization
measurements confirm VI$_3$ to be a hard ferromagnet (9.1 kOe coercive field at
2 K) with a high degree of anisotropy, and the pressure dependence of the
magnetic properties provide evidence for the two-dimensional nature of the
magnetic order. Optical and electrical transport measurements show this
material to be an insulator with an optical band gap of 0.67 eV - the previous
theoretical predictions of d-band metallicity then lead us to believe VI$_3$ to
be a correlated Mott insulator. Our latest band structure calculations support
this picture and show good agreement with the experimental data. We suggest
VI$_3$ to host great potential in the thriving field of low-dimensional
magnetism and functional materials, together with opportunities to study and
make use of low-dimensional Mott physics.

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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
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The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
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The categories of this paper are: q-bio