Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Paramagnetic-to-nonmagnetic transition in antiperovskite nitride
  Cr$_3$GeN studied by $^{14}$N-NMR and $\mu$SR   The antiperovskite-related nitride Cr$_3$GeN forms a tetragonal structure
with the space group $P\bar{4}2_1m$ at room temperature. It shows a tetragonal
($P\bar{4}2_1m$) to tetragonal ($I4/mcm$) structural transition with a large
hysteresis at 300--400 K. The magnetic susceptibility of Cr$_3$GeN shows
Curie-Weiss type temperature dependence at high temperature, but is almost
temperature-independent below room temperature. We carried out $\mu$SR and
$^{14}$N-NMR microscopy measurements to reveal the magnetic ground state of
Cr$_3$GeN. Gradual muon spin relaxation, which is nearly
temperature-independent below room temperature, was observed, indicating that
Cr$_3$GeN is magnetically inactive. In the $^{14}$N-NMR measurement, a
quadrupole-split spectrum was obtained at around $^{14}K = 0$. The temperature
dependence of $^{14}(1/T_1)$ satisfies the Korringa relation. These
experimental results indicate that the ground state of Cr$_3$GeN is Pauli
paramagnetic, without antiferromagnetic long-range order.

35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th