Magnetic phase transitions in R5NiPb3 (R=Ce, Nd, and Gd)
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We report magnetic and thermodynamic measurements for R5 NiPb3 (R=Ce, Nd, Gd). Gd5 NiPb3 has a transition at 68 K, apparently ferrimagnetic from specific heat and magnetization measurements. For Ce5 NiPb3, a phase transition is observed in heat capacity at 48 K, with the field dependence of heat capacity and magnetization also indicating ferrimagnetic behavior. Ce5 NiPb3 shows metamagnetism at low temperatures, behavior rather similar to Nd5 NiPb3 with its previously reported magnetic ordering below 42 K. Using nonmagnetic La5 NiPb3, we isolated the magnetic heat capacity for all three materials. The results include a relatively large linear- T term in the specific heat and integrated magnetic entropies consistently smaller than expected. 2009 American Institute of Physics.
