Two different anomalies have been observed the a.c. susceptibility-versus-temperature curves measured at several frequencies in the 3D Co-Cubane compound (K4{Co4(citr)4[μ-Co(H2O)4]2}·8H2O)n at low temperatures. The low temperature anomaly is not frequency dependent whereas the other is. This could be indicative of two different magnetic regimes; one due to the blocking of the Co-cubane SMM and the other due to the establishment of a long range magnetic order. In fact this has been corroborated by the measurement of the specific heat at low temperature where only a sharp peak is observed at 2.7 K. In this proposal we would like to investigate the long range magnetic order using the D20 neutron powder diffractometer.