论文类型：期刊论文
第一作者：C Mielke III
通讯作者：Z Guguchia,M Zahid Hasan,G Xu
合写作者：H Luetkens,A Amato,S Nakatsuji,S Jia,ZQ Wang,J Chang,R Khasanov,K Guo,D Das,H Nakamura,J-X Yin,Y Qin
发表刊物：Physical Review Materials
收录刊物：SCI
学科门类：理学
一级学科：物理学
文献类型：J
卷号：5
期号：3
页面范围：34803
ISSN号：2475-9953
发表时间：2021-03-29
影响因子：3.98
摘要：We report muon spin rotation (μSR) experiments together with first-principles calculations on microscopic properties of superconductivity in the kagome superconductor LaRu3Si2 with Tc ≃ 7K. Below Tc, μ SR reveals type-II superconductivity with a single s-wave gap, which is robust against hydrostatic pressure up to 2 GPa. We find that the calculated normal state band structure features a kagome flat band, and Dirac as well as van Hove points formed by the Ru-dz2 orbitals near the Fermi level. We also find that electron-phonon coupling alone can only reproduce a small fraction of Tc from calculations, which suggests other factors in enhancing Tc such as the correlation effect from the kagome flat band, the van Hove point on the kagome lattice, and the high density of states from narrow kagome bands. Our experiments and calculations taken together point to nodeless moderate coupling kagome superconductivity in LaRu3Si2.