ESR IN TERNARY GdT2Si2 SYSTEMS (T equals Co, Ni, Cu, Ru, Rh, Pd).

ESR spectra of GdT//2Si//2, T equals 3d or 3d metal, have been measured in a paramagnetic state. It was found that g-shift and thermal broadening of the Gd**3** plus resonance line ″b″ depends on the number of d-electrons in the band. The change of the electronic structure of the GdT//2Si//2 compounds, when the different 3d and 4d transition metals are the T-elements, influences visibly ESR spectra. All investigated compounds are bottlenecked systems. The bottleneck effect is stronger as the number of d-electrons in the band increases. The exchange coupling constant between CE and magnetic moments J//S//e is probably positive for GdCu//2Si//2.