Superconductivity and electron correlations in the kagome metal LuOs3B2

Yusen Xiao; Qingchen Duan; Tao jia; Yajing Cui; Shaohua Liu; Zhiwei Wen; Liangwen Ji; Ruidan Zhong; Yongliang Chen; Yong Zhao

doi:10.1103/PhysRevB.111.195132

Superconductivity and electron correlations in the kagome metal LuOs3B2

Yusen Xiao, Qingchen Duan, Tao jia, Yajing Cui, Shaohua Liu, Zhiwei Wen, Liangwen Ji, Ruidan Zhong, Yongliang Chen, Yong Zhao

DOI 10.1103/PhysRevB.111.195132 · Physical Review B

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Abstract

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 quasiflat 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 paper provides a thorough exploration of the superconducting and normal states of LuOs3B2, deepening the understanding of kagome superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LuOs3B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.63	Pressure unresolved	onset
LuOs3B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.55	Pressure unresolved	onset
LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.8	Pressure not reported	unknown
YRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	unknown