Abstract The cryogenic magnetic properties and magnetocaloric effects of Er3Ni2-type Nd3Rh2 (space group R-3, N148, hR45), and Y3Rh2-type RE3Rh2 (RE = Ho, Er) (space group I4/mcm, N140, tI140) have been investigated in detail. For the Nd3Rh2 compound, two second-order magnetic transitions, a ferromagnetic-antiferromagnetic transition followed by an antiferromagnetic-paramagnetic transition with temperature increasing, are observed at Tt = 13 K and TN = 17 K, respectively. For the RE3Rh2 (RE = Ho, Er) compounds, it exhibits a ferromagnetic ordering around the Curie temperature 23 K and 8 K, respectively. The reciprocal magnetic susceptibility of RE3Rh2 (RE = Ho, Er) obey the Curie-Weiss law in the paramagnetic region, the values of the effective magnetic moment are determined to be 10.30 μB/Ho3+ and 10.62 μB/Er3+, and the corresponding paramagnetic Curie temperatures are 13 K and 4.5 K, respectively. The maximum values of magnetic entropy changes for RE3Rh2 (RE = Nd, Ho and Er) are achieved to be 3.78 J/kg K, 14.01 J/kg K and 20.01 J/kg K with an effect refrigerant capacity values of 68 J/kg, 382 J/kg and 267 J/kg for a field change of 0–5 T, respectively. Large magnetocaloric effects indicate the potentiality of the RE3Rh2 (RE = Nd, Ho and Er) compounds as candidates in low temperature magnetic refrigerant.

中文翻译：

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RE3Rh2（RE = Nd、Ho 和 Er）金属间化合物的低温磁性和大磁热效应

摘要 Er3Ni2 型 Nd3Rh2（空间群 R-3、N148、hR45）和 Y3Rh2 型 RE3Rh2（RE = Ho、Er）（空间群 I4/mcm、N140、tI140）的低温磁性和磁热效应进行了详细调查。对于 Nd3Rh2 化合物，分别在 Tt = 13 K 和 TN = 17 K 处观察到两个二阶磁转变，即铁磁-反铁磁转变，然后是随温度升高的反铁磁-顺磁转变。对于 RE3Rh2 (RE = Ho, Er) 化合物，它分别在居里温度 23 K 和 8 K 附近表现出铁磁有序。RE3Rh2 的倒易磁化率 (RE = Ho, Er) 在顺磁区服从居里-魏斯定律，有效磁矩值确定为 10.30 μB/Ho3+ 和 10.62 μB/Er3+，相应的顺磁居里温度分别为 13 K 和 4.5 K。RE3Rh2（RE = Nd、Ho 和 Er）的磁熵变最大值达到 3.78 J/kg K、14.01 J/kg K 和 20.01 J/kg K，有效制冷剂容量值为 68 J/kg , 382 J/kg 和 267 J/kg 的磁场变化分别为 0-5 T。大磁热效应表明 RE3Rh2（RE = Nd、Ho 和 Er）化合物作为低温磁性制冷剂的候选物的潜力。