论文标题
巡回磁铁Zrfe $ _4 $ si $ _2 $的推定量子关键点带有沮丧的准二维结构
Putative quantum critical point in the itinerant magnet ZrFe$_4$Si$_2$ with a frustrated quasi-one-dimensional structure
论文作者
论文摘要
化合物zrfe $ _4 $ si $ _2 $中的Fe Sublattice具有几何挫败感和准二维性。因此，我们研究了Zrfe $ _4 $ SI $ _2 $中的磁性行为，并在将GE代替Si时，并在使用结构，磁性，热力学和电气传输探针的情况下将GE代替Si。磁性测量结果表明，Zrfe $ _4 $ SI $ _2 $保持有效力矩$μ_ {\ rm eff} = 2.18〜μ__ {b} $。在低温下，化合物显示出低于6 K的短距离磁序。我们的研究表明，将GE代替Si会增加单位细胞的体积并将短距离稳定为远距离旋转密度波动型磁性阶。另一方面，使用Zrfe $ _4 $（SI $ _ {0.88} $ GE $ _ {0.12} $）$ _ 2 $进行电抗性测量的静水压力研究，表示在增加压力时持续抑制了磁性订单。因此，我们的化学替代和静水压力研究表明，在Zrfe $ _4 $ si $ _2 $中存在晶格 - 体积控制的量子关键点。
The Fe sublattice in the compound ZrFe$_4$Si$_2$ features geometrical frustration and quasi-one-dimensionality. We therefore investigated the magnetic behavior in ZrFe$_4$Si$_2$ and its evolution upon substituting Ge for Si and under the application of hydrostatic pressure using structural, magnetic, thermodynamic, and electrical-transport probes. Magnetic measurements reveal that ZrFe$_4$Si$_2$ holds paramagnetic Fe moments with an effective moment $μ_{\rm eff}= 2.18~μ_{B}$. At low temperatures the compound shows a weak short-range magnetic order below 6 K. Our studies demonstrate that substituting Ge for Si increases the unit-cell volume and stabilizes the short-range order into a long-range spin-density wave type magnetic order. On the other hand, hydrostatic pressure studies using electrical-resistivity measurements on ZrFe$_4$(Si$_{0.88}$Ge$_{0.12}$)$_2$ indicate a continuous suppression of the magnetic ordering upon increasing pressure. Therefore, our combined chemical substitution and hydrostatic pressure studies suggest the existence of a lattice-volume-controlled quantum critical point in ZrFe$_4$Si$_2$.
