论文标题
由单轴压力控制的旋转密度波订单$ _2 $
Spin-density-wave order controlled by uniaxial stress in CeAuSb$_2$
论文作者
论文摘要
四方重型纤维化合物ceausb $ _2 $（太空$ p4/nmm $）表现出不加压的旋转密度波（SDW）订单以下$ t_ {n} \ lif6.5〜k $，大约6.5〜k $，带有宣传vector $ \ \ mathbf {q} Q} _a _a _a _a =（q} _a _a =（在[010]方向上应用单轴应力会引起电阻率比$ρ_A/ρ_b$在压缩应变为$ε\ \ -0.5 $ \％的突然变化。在这里，我们使用中子散射表明单轴应力诱导了具有不同传播向量$（0，Δ_B，1/2）$的一阶过渡，$δ_b= 0.25 $。新（B）相的磁性结构由CE层组成，其有序矩与沿$ C $轴堆叠的零矩交替的有序矩。订购的层沿$ B $轴具有上下倒下的配置。在这种情况下，空间反演的损失是由磁性顺序驱动的。我们认为，SDW波形的变化导致费米表面的重建和传输特性随之而来的变化。
The tetragonal heavy-fermion compound CeAuSb$_2$ (space group $P4/nmm$) exhibits incommensurate spin density wave (SDW) order below $T_{N}\approx6.5~K$ with the propagation vector $\mathbf{q}_A = (δ_A,δ_A,1/2)$. The application of uniaxial stress along the [010] direction induces a sudden change in the resistivity ratio $ρ_a/ρ_b$ at a compressive strain of $ε\approx -0.5$\%. Here we use neutron scattering to show that the uniaxial stress induces a first-order transition to a SDW state with a different propagation vector $(0,δ_B,1/2)$ with $δ_B=0.25$. The magnetic structure of the new (B) phase consists of Ce layers with ordered moments alternating with layers with zero moment stacked along the $c$-axis. The ordered layers have an up-up-down-down configuration along the $b$-axis. This is an unusual situation in which the loss of spatial inversion is driven by the magnetic order. We argue that the change in SDW wavevector leads to Fermi surface reconstruction and a concomitant change in the transport properties.
