论文标题
通过极化中子散射观察到的SR2RUO4超导状态中自旋敏感性的降低
Reduction of the spin susceptibility in the superconducting state of Sr2RuO4 observed by polarized neutron scattering
论文作者
论文摘要
最近的观察结果[A.〜Pustogow等。自然574，72（2019）]一滴$^{17} $ o核磁共振（NMR）骑士在Sr $ _2 $ _2 $ ruo $ _4 $ _4中的超导状态中的骑士移动挑战了这种化合物中手性奇数配对状态的流行图片。在这里，我们使用偏光性中子散射表明，在超导过渡温度下方的弦齿位置上有$ 34 \ pm 6美元的磁化率下降。测量值是在下部字段$ h \ sim \ tfrac {1} {3} h_ {c2} $的测量值，比以前的研究允许观察到抑制作用。我们的结果与最近的NMR观测值一致，并排除手性奇数$ \ Mathbf {d} = \ hat {\ Mathbf {z}}}（k_x \ pm ik_y）$ state。观察到的敏感性与最近的几项提案一致，包括偶数$ b_ {1g} $和奇数螺旋状态。
Recent observations [A.~Pustogow et al. Nature 574, 72 (2019)] of a drop of the $^{17}$O nuclear magnetic resonance (NMR) Knight shift in the superconducting state of Sr$_2$RuO$_4$ challenged the popular picture of a chiral odd-parity paired state in this compound. Here we use polarized neutron scattering to show that there is a $34 \pm 6$ % drop in the magnetic susceptibility at the ruthenium site below the superconducting transition temperature. Measurements are made at lower fields $H \sim \tfrac{1}{3} H_{c2}$ than a previous study allowing the suppression to be observed. Our results are consistent with the recent NMR observations and rule out the chiral odd-parity $\mathbf{d}=\hat{\mathbf{z}}(k_x\pm ik_y)$ state. The observed susceptibility is consistent with several recent proposals including even-parity $B_{1g}$ and odd-parity helical states.
