Kagome Metal GdNbSn: A 4d Playground for Topological Magnetism and Electron Correlations
arXiv:2501.00996 · doi:10.1103/PhysRevB.111.205103
Abstract
Magnetic kagome metals have garnered considerable attention as an ideal platform for investigating intrinsic topological structures, frustrated magnetism, and electron correlation effects. In this work, we present the synthesis and detailed characterization of GdNbSn, a metal that features a niobium-based kagome lattice and a frustrated triangular gadolinium network. The compound adopts the HfFeGe-type crystal structure, with lattice parameters of a = b = 5.765(4) Å and c = 9.536(8) Å. Magnetic susceptibility and specific heat measurements reveal a magnetic transition near 2.3 K. Electrical transport data confirm metallic behavior, unsaturated positive magnetoresistance, and a hole-dominated multiband Hall effect. Furthermore, first-principles calculations indicate that Nb-4d orbitals predominantly contribute to the electronic states near the Fermi energy, with the band structure showing multiple topologically nontrivial crossings around the Fermi surface. This study also compares GdNbSn with GdVSn, highlighting their similarities and differences. Our findings pave the way for exploring RNbSn (R = rare earth) with customized substitutions of R sites to fine-tune their properties.
7 pages, 7 figures
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