Abstract
Abstract Polycrystalline samples of the ternary intermetallics RIrGe (R=Tb,Ho,Er) were investigated by means of magnetization, X-ray and neutron diffraction measurements. For GdIrGe and DyIrGe only magnetic and X-ray diffraction measurements were performed. They crystallize in the orthorhombic TiNiSi-type structure. Magnetic measurements show antiferromagnetic ordering with Neel temperatures of 24 K for R=Gd and Tb, 15 K for R=Dy and 6.5 K for R=Er. HoIrGe is paramagnetic down to 1.5 K. Neutron diffraction data for TbIrGe indicate sine modulated magnetic ordering with the propagation vector k=(0,0.4093(2),0) and the magnetic moment parallel to the c-axis. In HoIrGe, no magnetic ordering is observed down to 1.5 K, while in ErIrGe a sine modulated structure with the moment parallel to the a-axis is observed below TN. Below Tt=2.9 K the coexistence two phases collinear and sine modulated is observed.
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