ANTIFERROMAGNETIC KONDO-LATTICE - CEPDSI2

The compounds CePdSi2, CeIrSi2 and CeRhSn2 have been synthesized and s tudied by X-ray diffraction, electrical resistivity and magnetic susce ptibility. The magnetic susceptibility of CePdSi2 exhibits two peaks a t 6.8 K and 2.5 K, respectively, indicating two antiferromagnetic phas e transitions, while that of CeIrSi2 shows a broad maximum at 150 K, c haracteristic of valence fluctuating Ce-compounds. CeRhSn2 remains par amagnetic down to 5 K. The resistivity of CeIrSi2 exhibits a T-2 depen dence at low temperatures, indicating a Fermi-liquid ground state, whi le those of CePdSi2 and CeRhSn2 shows the presence of Kondo and crysta l field effects.