论文标题
BAFE $ _2 $中的平面单轴压力诱导的平面外反铁磁矩和关键波动为$ _2 $
In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe$_2$As$_2$
论文作者
论文摘要
一个小的平面外部单轴压力已被广泛用作一种有效的方法，用于获取单个域铁pnictide bafe $ _2 $作为$ _2 $，它在四局局部表现出没有单轴菌株的双域，而单轴菌株低于四方到四方到甲型验证的结构（nematic）过渡温度$ t_s $ t_s $。尽管通常认为这种压力不会影响系统的固有电子/磁性，但已知它可以增强抗铁磁（AF）订购温度$ T_N $（$ <t_s $），并创建平面电阻率各向异性各向异性偏向于$ T_S $。在这里，我们使用中子极化分析表明，Bafe $ _2 $的这种压力为$ _2 $还引起了静态或准静态的平面外（$ C $ - 轴）AF订单及其在$ T_N/T_S $附近的关联临界旋转波动。因此，将BAFE $ _2 $ DITWIN单晶的单轴压力$ _2 $实际上旋转在$ t_n/t_s $附近旋转界线AF订单的简易轴，并且必须考虑自旋轨道耦合引起的效果，以确保系统的内在电子/磁性属性。
A small in-plane external uniaxial pressure has been widely used as an effective method to acquire single domain iron pnictide BaFe$_2$As$_2$, which exhibits twin-domains without uniaxial strain below the tetragonal-to-orthorhombic structural (nematic) transition temperature $T_s$. Although it is generally assumed that such a pressure will not affect the intrinsic electronic/magnetic properties of the system, it is known to enhance the antiferromagnetic (AF) ordering temperature $T_N$ ($<T_s$) and create in-plane resistivity anisotropy above $T_s$. Here we use neutron polarization analysis to show that such a strain on BaFe$_2$As$_2$ also induces a static or quasi-static out-of-plane ($c$-axis) AF order and its associated critical spin fluctuations near $T_N/T_s$. Therefore, uniaxial pressure necessary to detwin single crystals of BaFe$_2$As$_2$ actually rotates the easy axis of the collinear AF order near $T_N/T_s$, and such effect due to spin-orbit coupling must be taken into account to unveil the intrinsic electronic/magnetic properties of the system.
