MAGNETIC-STRUCTURE OF CERH2GE2

We report results of magnetic and resistivity measurements as well as neutron diffraction experiments on CeRh//2Ge//2 with ThCr//2 Si//2-type structure compound. Below T//N equals 15K, CeRh//2Ge//2 exhibits an incommensurate longitudinal static magnetization wave with moment and propagation direction along the c-axis (k equals left bracket 0, 0. 892 right bracket ). At 1. 5K, magnetic moments are localized on Ce ions only with m//o equals 2. 15(17) mu //B) for the maximum amplitude of the sine wave modulation. The results are discussed in terms of the RKKY exchange interaction as also in terms of the effects that 4f hybridization can have on ordering. A comparison between all the isotypic cerium compounds already studied and a general discussion are presented.