论文标题
在准二维旋转三个超导体的超导状态下的无间隙自旋脱位
Gapless spin-excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
论文作者
论文摘要
Majorana零模式形成为奇数一维超导体中的固有缺陷，从而激发了追求Majorana物理学的搜索。在这里，我们提出了合并的实验结果和第一原则计算，这表明准二维k $ _2 $ cr $ _3 $ as $ _3 $可能是一个超导体。使用非弹性中子散射，我们探测了K $ _2 $ CR $ _3 $的动态自旋 - 触感性，为$ _3 $和K $ _2 $ MO $ $ _3 $ as $ _3 $，并显示了两种化合物中抗Fiferromagnetic Spinet-Fluctucations的存在。在超导过渡下方，这些波动差距在k $ _2 $ mo $ $ _3 $ as $ _3 $中，但不在k $ _2 $ _2 $ cr $ _3 $ as $ _3 $中。使用第一原理计算，我们表明这些波动可能是由于在费米表面的一维特征上嵌套引起的。考虑到这些结果，我们建议，尽管k $ _2 $ mo $ $ $ _3 $ as $ _3 $是常规的超导体，但k $ _2 $ cr $ _3 $ aS $ _3 $可能是旋转式旋转三键，因此，拓制性超级导体。
Majorana zero modes form as intrinsic defects in an odd-orbital one-dimensional superconductor thus motivating the search for such materials in the pursuit of Majorana physics. Here, we present combined experimental results and first principles calculations which suggest that quasi-one-dimensional K$_2$Cr$_3$As$_3$ may be such a superconductor. Using inelastic neutron scattering we probe the dynamic spin-susceptibilities of K$_2$Cr$_3$As$_3$ and K$_2$Mo$_3$As$_3$ and show the presence of antiferromagnetic spin-fluctuations in both compounds. Below the superconducting transition, these fluctuations gap in K$_2$Mo$_3$As$_3$ but not in K$_2$Cr$_3$As$_3$. Using first principles calculations, we show that these fluctuations likely arise from nesting on one dimensional features of the Fermi surface. Considering these results we propose that while K$_2$Mo$_3$As$_3$ is a conventional superconductor, K$_2$Cr$_3$As$_3$ is likely a spin-triplet, and consequently, topological superconductor.
