Role of electronic correlations in the kagome-lattice superconductor LaRh3B2
Savita Chaudhary, Shama, Jaskaran Singh, Armando Consiglio, Domenico Di Sante, Ronny Thomale, Yogesh Singh
DOI 10.1103/PhysRevB.107.085103 · Physical Review B
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Abstract
LaRh3B2 crystallizes in a layered structure where Rh atoms form a perfect kagome lattice. The material shows superconductivity at Tc≈2.6 K and no signature for density wave instabilities. We report our measurements of electronic transport, magnetization, and heat capacity in the normal and superconducting state, and we derive normal and superconducting parameters. From first-principles calculations of the electronic band structure, we identify all features of kagome bands predominantly formed by the Rh d orbitals: a flat band, Dirac cones, and van Hove singularities. The calculation of the phonon dispersions and electron-phonon coupling suggests a strong similarity between LaRh3B2 and AV3Sb5 (A=K,Cs,Rb). For LaRh3B2, it matches quantitatively with the observed Tc, supporting a conventional phonon-mediated pairing mechanism. By comparison to the AV3Sb5 family, we conjecture that there is a reduced importance of electron correlations in LaRh3B2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaRh3B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.6 | Pressure unresolved | onset |
| LaRh3B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure unresolved | midpoint |
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
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