Abstract
The polycrystalline Yb23Cu7Mg4-type {Gd, Tb}23Ni7In4 compounds (space group P63/mmc, N 194, hP68) were prepared by arc melting with following annealing. They exhibit ferromagnetic ordering below Curie temperature TC = 142 K for Gd23Ni7In4 and TC = 112 K for Tb23Ni7In4, respectively. A field-sensitive antiferromagnetic transformation takes place around 90 K in Gd23Ni7In4 and 106 K in Tb26Ni7In4, respectively. Down to 10 K, they are soft ferromagnets with magnetizations of 4.7 μB/Gd for Gd23Ni7In4 and 5.7 μB/Tb for Tb23Ni7In4 in 90 kOe. In a field change of 50 kOe around TC, Gd23Ni7In4 shows magnetic entropy change of −4.7 J/kg⋅K at 133–143 K, while Tb23Ni7In4 shows magnetic entropy change of −5.4 J/kg⋅K at 109 K.
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