The Nd-Mn exchange interaction, low temperature specific heat and magnetism of Nd2/3Ca1/3MnO3

► Low temperature specific heat of Nd2/3Ca1/3MnO3 has been measured in magnetic fields up to 9 T. ► Schottky-like anomalies are fitted for each magnetic field by a sum of three Schottky functions. ► An effective magnetic field of the Mn spin system on Nd ion has been estimated as Hex=9 T. ► Nd3+ ground-state g-factors have been estimated as g||=3.4 and g⊥=2.2. ► Magnetic ordering of the Nd subsystem has been revealed below 30 K.