Magnetic properties and magnetocaloric effect in NdCo2B2 compound
Magnetic properties and magnetocaloric effect in NdCo2B2 compound
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DOI：
10.1088/0022-3727/42/14/145003
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
Lingwei Li;K. Nishimura
中科院分区：
文献类型：
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作者：
Lingwei Li;K. Nishimura
通过磁化和热容测试，研究了NdCo2B2的磁性能和磁热效应。该化合物在TC = 27k时呈现顺磁性向铁磁性转变。NdCo2B2的有效磁矩为3.53 μB/Nd原子，Nd离子的磁基态在NdCo2B2中形成重偶态。观察到一个大的可逆MCE，这与从顺磁性到铁磁性的二阶磁跃迁有关。在居里温度附近，当磁场变化为20和70 kOe时，最大磁熵变化（）分别达到4.5和8.3 J kg−1 K−1，无明显的磁滞损失。相应的最大绝热温度变化（）分别为3.3 K和6.9 K。
The magnetic properties and magnetocaloric effect (MCE) of NdCo2B2 were investigated by magnetization and heat capacity measurements. The compound exhibits a paramagnetic to ferromagnetic transition at TC = 27 K. The effective magnetic moment is 3.53 μB/Nd atom, and the magnetic ground state of Nd ion forms a doublet state in NdCo2B2. A large reversible MCE was observed, which is related to a second-order magnetic transition from the paramagnetic to the ferromagnetic state. The values of maximum magnetic entropy change ( ) reach 4.5 and 8.3 J kg−1 K−1 for field changes of 20 and 70 kOe without obvious hysteresis loss in the vicinity of the Curie temperature, respectively. The corresponding maximum adiabatic temperature changes ( ) are evaluated to be 3.3 and 6.9 K.