Abstract
Magnetic ordering of the polycrystalline Lu14Ni3In3-type Gd14Ni3Al3 and Tb14Ni3Al3 (space group P42/nmc, N 137, tP80) has been studied by magnetization, heat capacity and neutron diffraction study. The magnetization and heat capacity measurements of Gd14Ni3Al3 reveal the antiferromagnetic ordering at 62 K and low-temperature spin-reorientation transition at 42 K. Neutron diffraction study in zero applied magnetic field indicates non-collinear antiferromagnetic ordering of Tb14Ni3Al3. It exhibits abc-antiferromagnetic ordering with magnetic space group P21′/c′ (wave vector K0 = [0, 0, 0]) below 47 K and slight reorientation of terbium magnetic moments between 16 K and 36 K.
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