论文标题
列明波动介导的超导性超导性通过ba中的各向异性菌株（fe $ _ {1-x} $ co $ _x $）$ _ 2 $ as $ _2 $
Nematic fluctuations mediated superconductivity revealed by anisotropic strain in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$
论文作者
论文摘要
各向异性应变是一个能够选择性地解决列在促进超导性中的作用的外部场。我们使用偏振分辨的弹性 - 拉曼散射证明了这一点，以探测在基于范式的铁基超导体BA（fe $ _ {1-x} $ _x $ _x $ _x $ _2 $ _2 $ $ _2 $ $ _2 $的正常和超导状态下应变下列的演变。在非屈服的父级化合物$ _2 $作为$ _2 $的情况下，我们观察到应变诱导的对列敏感性的抑制，这遵循在对称断裂字段下的Ising订单参数的预期行为。对于超导化合物，对列敏感性的抑制与超导临界温度$ t_c $的降低相关。我们的结果表明，列的波动对电子配对的重要贡献，并验证了列明量子临界点附近增强的$ t_c $的理论场景。
Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-resolved elasto-Raman scattering to probe the evolution of nematic fluctuations under strain in the normal and superconducting states of the paradigmatic iron-based superconductor Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$. In the non-superconducting parent compound BaFe$_2$As$_2$ we observe a strain-induced suppression of the nematic susceptibility which follows the expected behavior of an Ising order parameter under a symmetry breaking field. For the superconducting compound, the suppression of the nematic susceptibility correlates with the decrease of the superconducting critical temperature $T_c$. Our results indicate a significant contribution of nematic fluctuations to electron pairing and validate theoretical scenarios of enhanced $T_c$ near a nematic quantum critical point.
