  Bulk single crystals of manganese phosphide (MnP) were grown from melt at 1
GPa and 1200 C by using a cubic-anvil, high-pressure, and high-temperature
technique. The obtained black colored crystals exhibit a plate-like morphology,
with flat surfaces and maximum dimensions up to 4 x 2 x 0.5 mm3. The
orthorhombic crystal structure was confirmed by X-ray diffraction [Pnma, 62, Z
= 4, a = 5.2510(4) {\AA}, b = 3.1670(3) {\AA}, c = 5.90098 (4) {\AA} and V =
98.279(14) {\AA}3]. Temperature-dependent magnetization measurements reveal the
occurrence of two successive transitions: a paramagnetic to ferromagnetic
transition at Tc = 290.5 K and the development of a double helimagnetic order
at Ts = 44.5 K. Zero-field 31P NMR measurements in the FM and in the screw-spin
AFM state show prominent features, which are compared with previous
experimental data and theoretical calculations. The relatively large crystals
obtained here open up new possibilities for further explorations of this
interesting material.
