Specific heat and AC susceptibility of antiferromagnetic Kondo lattices CeAu2Si2 and CeAg2Si2

Abstract We present results of magnetic and specific-heat study of polycrystalline and single-crystalline samples of the CeT 2 Si 2 compounds (T=Au, Ag). The CeAu 2 Si 2 single crystal shows, for a field applied along the c -axis, a field-induced transition at approx. 2 T, whereas there is no sign for the transition on the magnetization curve for the field applied along the a -axis. The CeAg 2 Si 2 compound shows no such anisotropic behavior on magnetization curves; only for the field applied along the c -axis there is a signature of a ground state characterized by small spontaneous moment (ferromagnetic component). The AC response is robust to frequency of the applied AC magnetic field in the case of CeAu 2 Si 2 , whereas the AC susceptibility of CeAg 2 Si 2 shows moderate frequency dependence.