  We investigated the low-temperature properties of polycrystalline
HoNi_2^11B_2C by means of ac-susceptibility and neutron powder diffraction in
the temperature range of 1.5 to 10 K and zero magnetic field. A sample with
pronounced re-entrant behaviour was chosen since it exhibits a superconducting
state which is strongly affected by the intrinsic magnetism, the formation of
long range magnetic order, via pair-breaking. The evolution and volume
fractions of the three different magnetic structures were observed and
correlated to the superconducting behaviour.
