Magnetic Properties and Specific Heat of Ce₅Pb₃ Compound

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Magnetic and specific heat measurements of Ce₅Pb₃ compound with a Mn₅Si₃-type structure have been carried out. The magnetic susceptibility shows two peaks at 3.5 and 20.5 K due to the magnetic transitions. The paramagnetic Curie tempertature and the effective magnetic moment obtained from the magnetic susceptibility are -8.2 K and 2.6μ_B, respectively. These results indicate that 4 f electrons are localized in high temperatures and the ground state is antiferromagnetic. The electronic specific heat coefficient, γ, is about 120 mJ/Ce-mol K², and the Debye temperature, θ_D, is estimated to be 150 K. From these results, it is concluded that Ce₅Pb₃ is an antiferromagnetic heavy-fermion compound. The Néel temperature T_N of Ce₅Pb₃ compound is higher than that of other Ce-Pb compounds, which is related to the two kinds of Ce sites.