In this study, it is shown that in a layered nitride superconductor, i.e., LixZrNCl (0.07<=x<=0.21), the superconducting order parameter is highly anisotropic in a sample with x=0.12, as inferred from both the temperature and the magnetic field dependences of the muon depolarization rate (sigma_s, proportional to the superfluid density). Moreover, the tendency of strong anisotropy with an increase in x is indicated by the T dependence of sigma_s. These observations are in good agreement with the recent theory that predicts the development of anisotropy in a d+id' gap upon carrier filling to the bands with disconnected Fermi surfaces on a honeycomb lattice.
Two dimensional nature of superconductivity in intercalated layered systems Li$_{x}$HfNCl and Li$_{x}$ZrNCl: muon spin relaxation and magnetization measurements
Extracting intrinsic superconducting properties in intercalated layered superconductors using an extended 2D Tinkham model
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理国家实验室）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；RIKEN Center for Emergent Matter Science (CEMS)（理化学研究所新兴物质科学中心）；Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, Ministry of Education, School of Physics, Beijing Institute of Technology（北京理工大学物理学院教育部先进光电子量子架构与测量重点实验室）；Songshan Lake Materials Laboratory（松山湖材料实验室）
Sensitivity of superconducting states to the impurity location in layered materials
由掺杂的拓扑绝缘体Bi $_2$ Se $_3$衍生的多层超导体家族已被发现对非磁性无序异常鲁棒。最近的实验研究强调了这样一个事实，即杂质的位置可能对这种令人困惑的鲁棒性起着关键作用。本文研究了四种不同类型的杂质对超导临界温度的影响。我们发现，不同的组件的散射势是积极的杂质配置和选择的轨道的正常状态的有效低能量描述。对于Bi $_2$ Se $_3$为基础的超导体的特定情况下，我们发现，只有杂质配置的对称份额有助于散射，这样极性杂质是完全不活跃的。我们还发现，一个更占主导地位的质量不平衡项在正常状态的哈密顿量可以使超导状态更强大的插入杂质，在现场或间隙杂质的情况下。
Intermittent dynamics of antiferromagnetic phase in inhomogeneous iron-based chalcogenide superconductor
以不同电子自由度为特征的相共存通常发生在层状超导体中。其中，碱性插层硫族化合物是顺磁（PAR）和反铁磁（AFM）相共存的模型系统，但不同阶段的时间行为仍然是未知的。在这里，我们报告的第一个可视化的原子运动在颗粒相的K $_{x}$ Fe $_{2-y}$ Se $_2$使用X射线光子相关光谱。与PAR相不同，AFM纹理揭示了间歇性的动态与雪崩在马氏体。当冷却到超导转变温度T $_c$时，AFM相经历了一个反常的慢化行为，表明AFM相中原子的运动与超导性之间存在直接关系。除了为层状超导体中类似雪崩的动力学提供令人信服的证据外，这些结果还为描述非均匀固体中量子态的新理论模型提供了基础。
