Charge density wave behavior and order-disorder in the antiferromagnetic metallic series Eu(Ga1−xAlx)4
Charge density wave behavior and order-disorder in the antiferromagnetic metallic series Eu(Ga1−xAlx)4
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反铁磁金属系列 Eu(Ga1−xAlx)4 中的电荷密度波行为和有序无序
DOI：
10.1103/physrevb.97.195146
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发表时间：
2018
影响因子：
3.7
通讯作者：
Morosan, E.
中科院分区：
文献类型：
--
作者：
Stavinoha, Macy;Cooley, Joya A.;Minasian, Stefan G.;McQueen, Tyrel M.;Kauzlarich, Susan M.;Huang, C.-L.;Morosan, E.
尽管Ga和Al的共价半径和电子构型相似，但固溶体以单晶形式生长，显示出与等结构末端化合物不同的丰富的结晶学、磁性和电子性质。本文报道了由磁化强度和随温度变化的比热所预测的磁自旋重定向和变磁相变的开始，它随温度的变化而非单调地变化，并且在20K左右达到最大值，其中晶格参数也显示出一个极小值。与电荷密度波行为相一致的随温度变化的电阻率的反常只对和1存在。密度泛函理论计算表明，与最终化合物相比，结构中的Ga-Al共价键之间的极化增加，因此晶体顺序和化学压力被认为是电荷密度波行为的原因。
The solid solutionwas grown in single crystal form to reveal a rich variety of crystallographic, magnetic, and electronic properties that differ from the isostructural end compoundsand, despite the similar covalent radii and electronic configurations of Ga and Al. Here we report the onset of magnetic spin reorientation and metamagnetic transitions forevidenced by magnetization and temperature-dependent specific heat measurements.changes nonmonotonously with, and it reaches a maximum around 20 K for, where thelattice parameter also shows an extreme (minimum) value. Anomalies in the temperature-dependent resistivity consistent with charge density wave behavior exist only forand 1. Density functional theory calculations show increased polarization between the Ga-Al covalent bonds in thestructure compared to the end compounds, such that crystallographic order and chemical pressure are proposed as the causes of the charge density wave behavior.