Antiferromagnetic Kondo-lattice system Ce_2RhSi_3 with moderate heavy-fermion behavior

摘要

We report here on the physical properties of single crystal, Ce_2RhSi_3. The low-temperature physical properties of Ce_2RhSi_3 are studied by means of magnetic susceptibility, electrical resistivity and specific heat measurements. Ce_2RhSi_3 shows the typical heavy-fermion antiferromagnetic behavior. The electrical resistivity ρ(T) shows -InT dependence from room temperature to 100 K and 20 to 5K. The specific heat exhibits λ-type anomaly at around T_N, while the value of magnetic entropy at T_N is reduced to 56% of RIn2. The linear coefficients of specific heat are 290 mJ/(Ce-mol K~2) below T_N. From these measurements, Ce_2RhSi_3 can be classified to be moderate heavy-fermion antiferromagnet.