Ultrapure metallic materials

This thesis deals with crystal structure and magnetic properties of RCr2Si2 (R = Pr, Tb, Er) and RCr2Si2C (R = La, Ce, Pr, Nd) compounds. All prepared samples were characterized by powder X-ray diraction and investigated by specic-heat, magnetization and AC-susceptibility measurements in the temperature range 2-900 K and in magnetic elds up to 9 T. The results suggest non-trivial magnetic ordering of the Cr sublattice in all studied compounds, accompanied with ferromagnetic ordering of the Pr and Nd magnetic moments below the Curie temperature of 30 and 21 K in PrCr2Si2C and NdCr2Si2C, respectively, and possible metamagnetism in CeCr2Si2C. For RCr2Si2C compounds, the experimental evidence of Cr magnetism is corroborated by results of extended rst-principles calculations based on the density functional theory