Nodeless kagome superconductivity in LaRu3Si2
Autor: | C. Mielke, Satoru Nakatsuji, Anthony A. Amato, H. Nakamura, S. Jia, M. Z. Hasan, Jiaxin Yin, Rustem Khasanov, Zurab Guguchia, Y. Qin, Gang Xu, Johan Chang, Hubertus Luetkens, Debarchan Das, K. Guo, Ziqiang Wang |
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Rok vydání: | 2021 |
Předmět: |
Superconductivity
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Hydrostatic pressure Dirac (software) Fermi level 02 engineering and technology Muon spin spectroscopy 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Atomic orbital Condensed Matter::Superconductivity Lattice (order) 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons General Materials Science 010306 general physics 0210 nano-technology Electronic band structure |
Zdroj: | Physical Review Materials. 5 |
ISSN: | 2475-9953 |
Popis: | 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. |
Databáze: | OpenAIRE |
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