STRUCTURAL AND MAGNETIC-PROPERTIES OF RMN(X)GE(2) (R=ND,SM,GD,TB,DY,HO,ER) INTERMETALLIC COMPOUNDS

Magnetic susceptibility and neutron diffraction data show that NdMn0.42Ge2, TbMn0.33Ge2 and HoMn0.33Ge2 which exhibit defected CeNiSi2 type crystal structure, order antiferromagnetically (G-mode ordering) below 34 +/- 2, 26 +/- 2 and 7 +/- 2 K with ordered magnetic moments on R(3+) ions amounting to 1.55(15), 7.0(1) and 7.3(1) mu(B), respectively. Magnetic susceptibility vs. temperature curves give Neel points at 30 K for DyMn0.32Ge2 and 35 K for GdMn0.38Ge2.ErMn0.27Ge2 was found to order below 4 K.