LaFe $_{1-x}$ Co $_x$ AsO中的磁化率演变
Evolution of the nematic susceptibility in LaFe$_{1-x}$Co$_x$AsO
摘要：
在一系列铁基超导体中识别出电子向列性提出了它与超导性和其他有序状态的关系的问题。本文报道了LaFe $_{1-x}$ Co $_x$ AsO单晶的弹性电阻率研究。所有的晶体在四方相都表现出类似Curie-Weiss的磁化率。提取的超导温度是单调抑制钴掺杂，并改变周围的最佳掺杂水平的符号，表明超导圆顶下可能的超导量子临界点。磁化率的幅值呈现出独特的双峰特征。这可以解释为不同的贡献的磁化率，这是放大在不同的掺杂水平的LaFe $_{1-x}$ Co $_x$ AsO的组合效应。
英文摘要：
The identification of electronic nematicity across series of iron-based superconductors raises the question of its relationship with superconductivity and other ordered states. Here, we report a systematic elastoresistivity study on LaFe$_{1-x}$Co$_x$AsO single crystals, which have well separated structural and magnetic transition lines. All crystals show Curie-Weiss-like nematic susceptibility in the tetragonal phase. The extracted nematic temperature is monotonically suppressed upon cobalt doping, and changes sign around the optimal doping level, indicating a possible nematic quantum critical point beneath the superconducting dome. The amplitude of nematic susceptibility shows a peculiar double-peak feature. This could be explained by a combined effect of different contributions to the nematic susceptibility, which are amplified at separated doping levels of LaFe$_{1-x}$Co$_x$AsO.
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