The magnetic and electronic properties of REAgSb2 compounds
The magnetic and electronic properties of REAgSb2 compounds
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REAgSb2 化合物的磁和电子性质
DOI：
10.1016/j.jmmm.2020.167442
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发表时间：
2020-10
影响因子：
2.7
通讯作者：
Weining Wu
中科院分区：
文献类型：
--
作者：
Xiaowei Wu;Wei He;Tonghan Yang;Guorui Xiao;Peiqi Chen;Yifei Bi;Weining Wu
通过对多晶样品的实验测量并结合第一性原理计算，研究了 REAgSb2 化合物（RE = La-Nd、Sm 和 Gd-Er）的磁性能和电子结构。 X射线粉末衍射分析表明，所有化合物均以四方HfCuSi2型结构结晶（空间群P4/nmm，No.129，tP8）。磁性测量结果表明LaAgSb2是非磁性的，CeAgSb2是铁磁性的，其他化合物是反铁磁性的。通过dM/dT图获得磁有序温度，分布在3.2和14.2 K之间。根据居里-韦斯定律，发现这些化合物的有效磁矩接近于REAgSb2中的稀土三价离子。根据 2 K 下的 MH 曲线观察到 REAgSb2(RE = Pr, Gd-Ho) 的变磁相变。Arrott 图表明 REAgSb2(RE = Ce, Pr) 的磁相变类型属于二级相变。 CeAgSb2 和 PrAgSb2 的最大磁熵变测得分别为 5.1 和 7.9 J.kg−1.K−1。基于密度泛函理论研究了REAgSb2化合物的电子结构。 REAgSb2的电子结构数据表明，DOS色散接近RE 4f电子，并且RE和Sb原子之间存在很强的相关性。对于 REAgSb2(RE = Ce-Sm, Gd)，RE 4f 和 Sb 5p 电子之间的杂化随着原子序数的变化逐渐增加，而对于其他化合物则逐渐减少。
Magnetic properties and electronic structure of REAgSb2compounds (RE = La-Nd, Sm and Gd-Er) were investigated by experimental measurements on their polycrystalline samples combining with first-principles calculation. X-ray powder diffraction analysis shows that all compounds crystallize in a tetragonal HfCuSi2-type structure (Space groupP4/nmm, No. 129, tP8). The results of magnetic measurements reveal that LaAgSb2is non-magnetic, CeAgSb2is ferromagnetic, and other compounds are antiferromagnetic. The magnetic ordering temperatures were obtained by dM/dTplots, which are distributed between 3.2 and 14.2 K. According to Curie-Weiss law, it was found that the effective magnetic moments of these compounds are close to rare earth trivalent ions in REAgSb2. The metamagnetic transitions are observed for REAgSb2(RE = Pr, Gd-Ho) according to M−H curves at 2 K. The Arrott plots reveal that the magnetic phase transition type belongs to second-order phase transition for REAgSb2(RE = Ce, Pr). The maximum magnetic entropy changes of CeAgSb2and PrAgSb2are measured to be 5.1 and 7.9 J.kg−1.K−1, respectively. The electronic structures of REAgSb2compounds have been studied based on density functional theory. The electronic structures data of REAgSb2suggest that the DOS dispersions are close to the RE 4f electrons and there is a strong correlation between RE and Sb atoms. The hybridization between RE 4f and Sb 5p electrons gradually increases as a function of atomic number for REAgSb2(RE = Ce-Sm, Gd), while gradually decreases for the other compounds.
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影响因子：
6.2
作者：
Sachin Gupta;K. Suresh;A. Nigam;Y. Mudryk;D. Paudyal;V. Pecharsky;K. Gschneidner
通讯作者：
Sachin Gupta;K. Suresh;A. Nigam;Y. Mudryk;D. Paudyal;V. Pecharsky;K. Gschneidner
影响因子：
2.7
作者：
K.D Myers;S. Bud’ko;I.R Fisher;Z. Islam;H. Kleinke;A.H Lacerda;P. Canfield
通讯作者：
K.D Myers;S. Bud’ko;I.R Fisher;Z. Islam;H. Kleinke;A.H Lacerda;P. Canfield
影响因子：
--
作者：
B. Chevalier;J. Etourneau
通讯作者：
B. Chevalier;J. Etourneau
影响因子：
6.2
作者：
A. Szytuła;M. Kolenda;A. Oleś
通讯作者：
A. Szytuła;M. Kolenda;A. Oleś
DOI：
10.1016/0031-9163(64)91158-8
发表时间：
1964-01-01
期刊：
PHYSICS LETTERS
影响因子：
--
作者：
BANERJEE, SK
通讯作者：
BANERJEE, SK