LaRh3B2 crystallizes in a layered structure where Rh atoms form a perfect kagome lattice. The material shows superconductivity at Tc approximate to 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.
Chaudhary, S., Shama, n., Singh, J., Consiglio, A., Di Sante, D., Thomale, R., et al. (2023). Role of electronic correlations in the kagome-lattice superconductor LaRh3B2. PHYSICAL REVIEW. B, 107(8), 1-8 [10.1103/physrevb.107.085103].
Role of electronic correlations in the kagome-lattice superconductor LaRh3B2
Di Sante, Domenico;
2023
Abstract
LaRh3B2 crystallizes in a layered structure where Rh atoms form a perfect kagome lattice. The material shows superconductivity at Tc approximate to 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.File | Dimensione | Formato | |
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