Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of antiferromagnetic order collapse in the pressurized
  insulator LaMnPO   The emergence of superconductivity in the iron pnictide and cuprate high
temperature superconductors usually accompanies the suppression of an
antiferromagnetically (AFM) ordered state in a corresponding parent compound
through the use of chemical doping or external pressure1-5. A great deal of
effort has been made to find superconductivity in Mn-based compounds6-14, which
are thought to bridge the gap between the two families of high temperature
superconductors7,15,16, but long-ranged AFM order was not successfully
suppressed via chemical doping in these investigations. Here we report the
first observation of the pressure-induced elimination of long-ranged AFM order
in LaMnPO single crystals that are iso-structural to the LaFeAsO
superconductor15,17. By combining in-situ high pressure resistance and ac
susceptibility measurements, we found that LaMnPO undergoes a crossover from an
AFM insulating to an AFM metallic state at a pressure ~20 GPa and that the
long-ranged AFM order collapses at a higher pressure ~32 GPa. Our findings are
of importance to explore potential superconductivity in Mn-based compounds and
to shed new light on the underlying mechanism of high temperature
superconductivity.

28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph