论文标题
平面各向异性响应对单轴压力的隐藏订单状态$ _2 $ si $ _2 $
In-plane anisotropic response to the uniaxial pressure in the hidden order state of URu$_2$Si$_2$
论文作者
论文摘要
我们研究了URU $ _ {2-x} $ fe $ _x $ _x $ _2 $样品的单轴压力依赖性，分别具有$ x $ = 0和0.2的样品，该样品分别携带了一个隐藏的订单（HO）和大型的抗fiferromagnetic（HO）。对于这两个样本，弹性见度$ζ$都在过渡温度$ t_0 $上方看似不同的行为，而快速降低了它。我们发现，可以通过假设$ x $ = 0样品的$ζ_ {（110）} $对两个样品的单倍压力效应对两个样品的温度依赖性可以很好地描述，该级别的温度依赖性在0 k中表现出$ x $ = 0的$ζ_ {（110）} $，在0 K中表现出非零残留值。我们显示这提供了HO和LMAFMFMFM和LMAFMFM之间的定性差异。我们的结果表明，对单轴压力的平面各向异性反应只有在隐藏的顺序状态下存在而无需打破旋转晶格对称性。
We studied the uniaxial-pressure dependence of the resistivity for URu$_{2-x}$Fe$_x$Si$_2$ samples with $x$ = 0 and 0.2, which host a hidden order (HO) and a large-moment antiferromagnetic (LMAFM) phase, respectively. For both samples, the elastoresistivity $ζ$ shows a seemingly divergent behavior above the transition temperature $T_0$ and a quick decrease below it. We found that the temperature dependence of $ζ$ for both samples can be well described by assuming the uniaxial pressure effect on the gap or certain energy scale except for $ζ_{(110)}$ of the $x$ = 0 sample, which exhibits a non-zero residual value at 0 K. We show that this provides a qualitative difference between the HO and LMAFM phases. Our results suggest that there is an in-plane anisotropic response to the uniaxial pressure that only exists in the hidden order state without necessarily breaking the rotational lattice symmetry.
