Abstract
Magnetic and transport properties of Ho 7Rh 3 single crystals have been studied by measuring magnetization, magnetic susceptibility, electrical resistivity and by performing neutron-diffraction experiments. Ho 7Rh 3 has two magnetic transitions from paramagnetic to antiferromagnetic at T N=34 K and from antiferromagnetic to ferrimagnetic at T C=22 K. In the ferrimagnetic phase, a small spontaneous magnetization in the c-plane is observed. It is found by neutron-diffraction measurements that Ho 7Rh 3 has a modulated incommensurate helical magnetic structure with the propagation vector Q=(0,0,0.38) at 1.5 K.
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