发表机构
Max Planck Institute for Chemical Physics of Solids; Institute for Quantum Materials and Technology, Karlsruhe Institute of Technology（马克斯·普朗克固体化学物理研究所; 卡尔斯鲁厄理工学院量子材料与技术研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究在局部非中心对称的CeNi$_2$As$_2$同构体中发现重费米子超导电性，其非相干正常态与UBe$_{13}$相似，为理解非常规超导机制提供了新视角。
AI 中文摘要
近年来，受UTe$_\ ext{2}$和CeRh$_\ ext{2}$As$_\ ext{2}$中多个超导相发现的启发，重费米子超导电性研究备受关注。在后者材料中，沿晶体学$\ extit{c}$方向施加磁场时观察到的两个超导相与局部反演对称性破缺相关。为加深对这些现象的理解，非常有必要在具有局部非中心对称结构的材料中寻找更多重费米子超导电性的实例。我们通过生长CeNi$_\ ext{2}$As$_\ ext{2}$的CaBe$_\ ext{2}$Ge$_\ ext{2}$同构体单晶，成功实现了这一目标。由此产生的超导电性带来的发现超出了我们的预期。除了提供与CeRh$_\ ext{2}$As$_\ ext{2}$进行比较和对比的机会外，其凝聚过程发生于一个非相干正常态，该正常态在定量上与UBe$_\ ext{13}$相似。因此，我们的发现不仅对局部非中心对称结构中的超导电性，而且对非常规超导电性本身提出了深刻的问题。
英文摘要
Recent years have seen intense research on heavy fermion superconductivity, inspired by the discovery of multiple superconducting phases in UTe$_\text{2}$ and CeRh$_\text{2}$As$_\text{2}$. In the latter material, two superconducting phases observed under applied magnetic field oriented along the crystallographic $\textit{c}$ direction are associated with local inversion symmetry breaking. To advance understanding of these phenomena, it is highly desirable to find further examples of heavy fermion superconductivity in materials with locally non-centrosymmetric structure. We have succeeded in this quest, by growing single crystals of the CaBe$_\text{2}$Ge$_\text{2}$ isomorph of CeNi$_\text{2}$As$_\text{2}$. The resulting superconductivity brings more than we had foreseen. In addition to providing the opportunity to compare and contrast with that of CeRh$_\text{2}$As$_\text{2}$, the condensation occurs from an incoherent normal state quantitatively similar to that of UBe$_\text{13}$. Our findings therefore raise profound questions not just about superconductivity in the locally non-centrosymmetric structures, but about unconventional superconductivity itself.
Comments22 pages, 8 figures. Includes supplemental material
