@article{41d1d93b98aa4d89b22fc30da159c617,
title = "Nodeless kagome superconductivity in LaRu3Si2",
abstract = "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, μSR 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.",
author = "C. Mielke and Y. Qin and Yin, {J. X.} and H. Nakamura and D. Das and K. Guo and R. Khasanov and J. Chang and Wang, {Z. Q.} and S. Jia and S. Nakatsuji and A. Amato and H. Luetkens and G. Xu and Hasan, {M. Z.} and Z. Guguchia",
note = "Funding Information: experiments under pressure were performed at the beamline of the Paul Scherrer Institute (Villigen, Switzerland) using the instrument GPD, where an intense high-energy ( MeV/c) beam of muons is implanted in the sample through the pressure cell. Further details of sample characterization and calculations may be found in the Supplemental Material . Z.G. thanks Rafael Fernandes for useful discussions. M.Z.H. acknowledges visiting scientist support from IQIM at the California Institute of Technology. Z.Q.W. is supported by DOE grant No. DE-FG02-99ER45747. G.X. and Y.Q. would like to thank the support of the National Key Research and Development Program of China (2018YFA0307000) and the National Natural Science Foundation of China (11874022). Work at Princeton University was supported by the Gordon and Betty Moore Foundation (GBMF4547 and GBMF9461; M.Z.H.). The theoretical work and sample characterization are supported by the United States Department of Energy (U.S. DOE) under the Basic Energy Sciences programme (Grant No. DOE/BES DE-FG-02-05ER46200; M.Z.H.). This work was also supported by the National Natural Science Foundation of China Grants No. 11774007 and No. U1832214, the National Key R&D Program of China (2018YFA0305601) and the strategic Priority Research Program of Chinese Academy of Sciences, Grant No. XDB28000000. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",
year = "2021",
month = mar,
doi = "10.1103/PhysRevMaterials.5.034803",
language = "English (US)",
volume = "5",
journal = "Physical Review Materials",
issn = "2475-9953",
publisher = "American Physical Society",
number = "3",
}