Abstract
Magnetic and neutron diffraction studies have been performed on an Er 7Rh 3 single crystal. The magnetic measurements show that there are two successive antiferromagnetic transitions at T N=13.0 K and T t1=6.2 K. A small magnetic anisotropy is observed in the paramagnetic susceptibility. Neutron diffraction also shows evidence of a commensurate to incommensurate magnetic transition at T t2=4.5 K. The magnetic structure in the low temperature antiferromagnetic phase below T t2 is characterized by the two magnetic propagation vectors k 1=(0 0 1/2) and k 2=(0 0 1). With increasing temperature, the magnetic modulation characterized by k 2 disappears at T t1 but the z-component is temperature independent. On the other hand, the magnetic modulation characterized by k 1 becomes incommensurate at T t2 where k 1=(0 0 0.42) and persists in the high temperature phase between T t1 and T N.
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