Magnetic properties in CeRu2Si2 and CeNi2Ge2 under uniaxial pressure

Abstract The effect of uniaxial pressure on the magnetic susceptibility, measured with the magnetic field parallel to the pressure, in the anomalous heavy-fermion CeRu 2 Si 2 and CeNi 2 Ge 2 is reported. In both systems, the pressures parallel to the tetragonal axis largely suppress the magnetic susceptibility χ c and shift the maximum in χ c at T max to higher temperatures, apparently indicating the enhancement of the c–f hybridization. On the other hand, the pressures parallel to the a -axis slightly enhance the magnetic susceptibility χ a in CeRu 2 Si 2 and suppress that in CeNi 2 Ge 2 .