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首页> 外文期刊>Physical review >Magnetic properties of the heavy-fermion antiferromagnet CeMg3
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Magnetic properties of the heavy-fermion antiferromagnet CeMg3

机译：重金属铁磁体CeMg3的磁性

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We have grown the single crystals of CeMg_3 and its nonmagnetic analog LaMg_3, which crystallize in the cubic crystal structure with the space group Fm3m, and studied their magnetic properties on well-oriented single crystals by measuring the magnetic susceptibility, magnetization, electrical resistivity, and heat capacity. CeMg_3 orders antiferromagnetically with a Neel temperature T_N of 2.6 K. The specific heat capacity at low temperature exhibits an enhanced Sommerfeld coefficient of 370 mJ/K~2 mol, indicating the heavy-fermion nature of CeMg_3. An estimation of the Kondo temperature T_K was made and it was found that it is of a magnitude similar to that of T_n. The reduced value of the magnetization below the ordering temperature, together with the reduced entropy at the magnetic ordering temperature and the enhanced low-temperature heat capacity, indicates that Kondo effect plays a significant role in this compound. The electrical resistivity measurement suggests that CeMg_3 is a Kondo lattice compound. We have performed a crystalline electric field (CEF) analysis on the magnetic susceptibility and the heat capacity data and found that the ground state is a F_7 doublet with an overall splitting of 191 K.
机译：我们已经生长了CeMg_3及其非磁性类似物LaMg_3的单晶，它们以Fm3m的空间群在立方晶体结构中结晶，并通过测量磁化率，磁化强度，电阻率和磁化率，研究了它们在取向良好的单晶上的磁性能。热容量。 CeMg_3在Neel温度T_N为2.6 K时反铁磁有序。低温下的比热容显示出370 mJ / K〜2 mol的增强的Sommerfeld系数，表明CeMg_3的重费米性质。估算了近藤温度T_K，发现其大小与T_n相似。低于有序温度的磁化强度降低值，以及有序磁化温度下的熵降低和低温热容增强，表明近藤效应在该化合物中起着重要作用。电阻率测量表明CeMg_3是近藤晶格化合物。我们对磁化率和热容数据进行了结晶电场（CEF）分析，发现基态为F_7双重峰，整体裂隙为191K。

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