Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropic magnetocaloric effect in single crystals of CrI$_3$   We report a systematic investigation of dc magnetization and ac
susceptibility, as well as anisotropic magnetocaloric effect in bulk CrI$_3$
single crystals. A second-stage magnetic transition was observed just below the
Curie temperature $T_c$, indicating a two-step magnetic ordering. The low
temperature thermal demagnetization could be well fitted by the spin-wave model
rather than the single-particle model, confirming its localized magnetism. The
maximum magnetic entropy change $-\Delta S_M^{max} \sim 5.65$ J kg$^{-1}$
K$^{-1}$ and the corresponding adiabatic temperature change $\Delta T_{ad} \sim
2.34$ K are achieved from heat capacity analysis with the magnetic field up to
9 T. Anisotropy of $\Delta S_M(T,H)$ was further investigated by isothermal
magnetization, showing that the difference of $-\Delta S_M^{max}$ between the
$ab$ plane and the $c$ axis reaches a maximum value $\sim$ 1.56 J kg$^{-1}$
K$^{-1}$ with the field change of 5 T. With the scaling analysis of $\Delta
S_M$, the rescaled $\Delta S_M(T,H)$ curves collapse onto a universal curve,
indicating a second-order type of the magnetic transition. Furthermore, the
$-\Delta S_M^{max}$ follows the power law of $H^n$ with $n = 0.64(1)$, and the
relative cooling power RCP depends on $H^m$ with $m = 1.12(1)$.

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The categories of this paper are: solv-int
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
2
The categories of this paper are: math
21
The categories of this paper are: adap-org