Low-Temperature Magnetic Properties of Large Coordination Compounds CeZn₁₁ and UZn₁₂

抄録

We investigated two intermetallic compounds, CeZn₁₁ and UZn₁₂, for heavy-electron behavior and found that the coefficient of low-temperature specific heat is about 850∼900 mJ/(mol K²) for UZn₁₂. The compound CeZn₁₁, which has a relatively small γ value of 43.2 mJ/(mol K²), exhibited an antiferromagnetic long-range order at 2.0 K evidenced by a large peak of the specific heat and a broad maximum in the susceptibility, while UZn₁₂ exhibited neither superconducting nor magnetic phase transition down to 0.4 K.