UBe$_{13}$的晶体不完美性与奇异超导电性
Crystallographic imperfections and exotic superconductivity of UBe$_{13}$
- Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）
- The University of Tokyo（东京大学）
- Faculty of Mathematics and Physics, University of Ljubljana（卢布尔雅那大学数学物理学院）
- Jožef Stefan Institute（约热·斯蒂芬研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文通过微结构加工研究无铝UBe$_{13}$晶体，发现微小晶体不完美性剧烈影响其临界温度与临界场，揭示其非常规超导性源于铀氧化态对晶体环境的敏感性，并为识别非常规超导体能隙对称性提供新途径。
AI中文摘要：
超导能隙的对称性与晶体结构的对称性相关。在非常规超导体中，即使晶格受到微小扰动，临界温度、临界场甚至能隙结构也可能发生巨大变化。在本信中，我们利用微结构加工技术研究了无铝的UBe$_{13}$晶体，这些晶体预计比先前研究的铝助熔剂生长的单晶更接近“完美”材料。我们比较了微小不完美性对临界温度和临界场值的影响，在UBe$_{13}$的情况下，这种影响是剧烈的，支持了其非常规性质。我们推测这很可能源于铀的氧化态，而铀的氧化态对其晶体环境敏感。我们的发现表明，铀基材料不仅提供了新的非常规现象的优秀储备库，而且提供了一种识别非常规超导体能隙对称性的途径。
英文摘要：
The symmetry of the superconducting gap is related to the symmetry of the crystal structure. In unconventional superconductors, big changes of the critical temperature, critical field or even the gap structure can happen even for small perturbations of the lattice. In this letter, we use microstructuring to study aluminium-free crystals of UBe$_{13}$ which are expected to be closer to "perfect" material than previously studied aluminium-grown single crystals. We compare the effect of minuscule imperfections on the value of the critical temperature and critical field, which, in the case of UBe$_{13}$, has drastic effects, supporting its unconventional nature. We conjecture that this likely arises from the oxidation state of uranium, which is sensitive to its crystal environment. Our findings suggests that uranium-based materials provide not only an excellent reservoir of new unconventional phenomena, but also a way to identify the gap symmetry of unconventional superconductors.
