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We report on the results of the magnetic susceptibility χ ( T ) , electrical resistivity ρ ( T ) and specific heat C ( T ) of CeRh 2 Si , which crystallizes in a new BaAl 4 -derivative structure. The Curie–Weiss behavior in χ ( T ) reveals that Ce ions in CeRh 2 Si is trivalent. At low temperatures, χ ( T ) shows a broad peak at 1 K and a hysteresis below the peak temperature. These observations suggest that CeRh 2 Si undergoes a spin-glass transition at T sg ∼ 1 K . On the other hand, heavy-fermion behavior was recognized by two maxima in ρ ( T ) and a large electronic specific heat coefficient ∼ 100 mJ / mol K 2 . Therefore, CeRh 2 Si is a heavy-fermion compound.

We have studied the magnetic and transport properties of CeIr 3 Si 2 by means of the electrical resistivity ρ ( T ) , specific heat C ( T ) and magnetization M ( T , B ) measurements. All the measurements display two anomalies due to the magnetic transitions at T N 1 = 4.1 K and T N 2 = 3.3 K . In particular, the transition at T N 2 is ferrimagnetic because of a sudden increase of M ( T ) / B and a hysteresis in M ( B ) at 1.9 K. Moreover, M ( B ) shows four successive metamagnetic transitions at 0.6, 0.9, 1.2 and 1.43 T. Above T N 1 , a - ln T dependence and a maximum at 15 K in the magnetic part of ρ ( T ) manifest that CeIr 3 Si 2 is a Kondo-lattice compound.