  The suppression of magnetic order with pressure concomitant with the
appearance of pressure- induced superconductivity was recently discovered in
CrAs. Here we present a neutron diffraction study of the pressure evolution of
the helimagnetic ground-state towards and in the vicinity of the
superconducting phase. Neutron diffraction on polycrystalline CrAs was employed
from zero pressure to 0.65 GPa and at various temperatures. The helimagnetic
long-range order is sustained under pressure and the magnetic propagation
vector does not show any considerable change. The average ordered magnetic
moment is reduced from 1.73(2) {\mu}B at ambient pressure to 0.4(1) {\mu}B
close to the critical pressure Pc=0.7 GPa, at which magnetic order is
completely suppressed. The width of the magnetic Bragg peaks strongly depends
on temperature and pressure, showing a maximum in the region of the onset of
superconductivity. We interpret this as associated with competing ground-states
in the vicinity of the superconducting phase.
