Specific heat measurements of CePt3SiCePt3Si and Ce1+xPt3+ySi1+zCe1+xPt3+ySi1+z

We have measured the specific heat of a series of polycrystalline CePt3SiCePt3Si and Ce1+xPt3+ySi1+zCe1+xPt3+ySi1+z samples whose compositions vary slightly from the stoichiometric composition. We observed two peaks derived from magnetic anomalies on the specific heat measurements of the Ce1+xPt3+ySi1+zCe1+xPt3+ySi1+z samples. One of the peaks relates to the antiferromagnetic phase transition at TN=2.2K. The other is a large peak at 2.7 K observed for the sample that showed a ferromagnetic anomaly at 3.0 K on the temperature dependence of the magnetization. Heat treatment had different effects between these anomalies.