论文标题
Cualcr的合成，物理和磁性$ _4 $ S $ _8 $：一种新的基于CR的呼吸pyrochlore
Synthesis, physical and magnetic properties of CuAlCr$_4$S$_8$: a new Cr-based breathing pyrochlore
论文作者
论文摘要
我们介绍了新的呼吸pyrochlore磁铁cualcr $ _4 $ s $ _8 $的合成和物理特性，借助于同步器X射线衍射（XRD），在环境下和施加的静水压力，热量，热容量，热量和muon旋转/旋转/旋转/旋转（$ $ $ SR）。 Cualcr $ _4 $ S $ _8 $表现出正热膨胀，并具有向上的温度依赖性。我们观察到纯磁性在20 K处的急剧抗铁磁有序过渡，在施加600 MPa压力时，纯磁性在20 K时移动多达3.2 k。呼吸因子（b $ _f $ = $ j'/j $）呼吸pyrochlores可能是调整pyrochlore晶格的磁接地状态的重要参数。呼吸因子可以通过呼吸比（通过在呼吸pyrochlore结构中的A和A位置上使用不同的元素）来调节两个四面体的大小的比率。我们发现cualcr $ _4 $ s $ _8 $的呼吸比为1.0663（8），与其他硫呼吸的pyrochlores相当。
We present the synthesis and physical properties of a new breathing pyrochlore magnet CuAlCr$_4$S$_8$ with the help of synchrotron x-ray diffraction (XRD), magnetization under ambient and applied hydrostatic pressure, heat capacity, and muon spin relaxation/rotation ($μ$SR) measurements. CuAlCr$_4$S$_8$ exhibits positive thermal expansion with concave upward temperature dependence. We observed a sharp antiferromagnetic ordering transition of a purely magnetic nature at 20 K, which shifts by as much as 3.2 K on the application of 600 MPa pressure. The breathing factor (B$_f$ = $J'/J$) in breathing pyrochlores can be an important parameter to tune the magnetic ground states of the pyrochlore lattice. The breathing factor can be modulated through breathing ratio, the ratio of sizes of the two tetrahedra, by using different elements at A and A' sites in the breathing pyrochlore structure. We find that CuAlCr$_4$S$_8$ has a breathing ratio of 1.0663(8), which is comparable to other sulfur breathing pyrochlores.
