标题： 笼目金属LuOs3B2中的超导性和电子关联性 显示英文标题

标题： Superconductivity and Electron Correlations in Kagome Metal LuOs3B2

摘要： 我们报道了对LuOs3B2物理性质的全面研究，该材料以其理想的基于Os的kagome晶格为特征。电阻率和磁化测量证实了II型体超导性的出现，临界温度Tc=4.63 K。比热跃迁和计算出的电子-声子耦合参数支持一种适度耦合的超导态。 增强的威尔逊比率表明电子关联效应的存在。 第一性原理计算揭示了kagome能带结构的标志性特征，包括Dirac点、van Hove奇点和准平带，这些主要来源于Os的d轨道。自旋轨道耦合的引入在Dirac点打开一个能隙，显著改变了电子性质。 此外，还讨论了同构化合物的超导性和电子性质。 这项工作对LuOs3B2的超导态和正常态进行了深入探索，深化了对kagome超导体的理解。 显示英文摘要

摘要： We report a comprehensive investigation of the physical properties of LuOs3B2, characterized by an ideal Os-based kagome lattice. Resistivity and magnetization measurements confirm the emergence of type-II bulk superconductivity with a critical temperature Tc=4.63 K. The specific heat jump and the calculated electron-phonon coupling parameter support a moderately coupled superconducting state. Electron correlation effects are supported by the enhanced Wilson ratios. First-principles calculations reveal hallmark features of kagome band structure, including Dirac points, van Hove singularities, and quasi-flat bands, primarily derived from the Os d orbitals. The inclusion of spin-orbit coupling opens a gap at the Dirac points, significantly altering the electronic properties. Furthermore, the superconductivity and electronic properties of isomorphic compounds are discussed. This work provides a thorough exploration of the superconducting and normal states of LuOs3B2, deepening the understanding of kagome superconductors.