Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pressure dependence of the magnetic ground states in MnP   MnP, a superconductor under pressure, exhibits a ferromagnetic order below
TC~290 K followed by a helical order with the spins lying in the ab plane and
the helical rotation propagating along the c axis below Ts~50 K at ambient
pressure. We performed single crystal neutron diffraction experiments to
determine the magnetic ground states under pressure. Both TC and Ts are
gradually suppressed with increasing pressure and the helical order disappears
at ~1.2 GPa. At intermediate pressures of 1.8 and 2.0 GPa, the ferromagnetic
order first develops and changes to a conical or two-phase (ferromagnetic and
helical) structure with the propagation along the b axis below a characteristic
temperature. At 3.8 GPa, a helical magnetic order appears below 208 K, which
hosts the spins in the ac plane and the propagation along the b axis. The
period of this b axis modulation is shorter than that at 1.8 GPa. Our results
indicate that the magnetic phase in the vicinity of the superconducting phase
may have a helical magnetic correlation along the b axis.

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The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph