Electronic properties of the topological kagome metals YV6Sn6 and GdV6Sn6

Article

关键词: TOTAL-ENERGY CALCULATIONS;    PLANE-WAVE;    CRYSTAL-STRUCTURE;    VISUALIZATION;    TRANSITION;    SCHEMES;    SYSTEMS;    COHP;    TOOL;   

DOI  :  10.1103/PhysRevB.104.235139

来源: SCIE

【 摘 要 】

The synthesis and characterization of vanadium-based kagome metals YV6Sn6 and GdV6Sn6 are presented. X-ray diffraction, magnetization, magnetotransport, and heat capacity measurements reveal an ideal kagome network of V ions coordinated by Sn and separated by triangular lattice planes of rare-earth ions. The onset of low-temperature magnetic order of Gd spins is detected in GdV6Sn6 and is suggested to be noncollinear, while V ions in both compounds remain nonmagnetic. Density functional theory calculations are presented modeling the band structures of both compounds, which can be classified as Z2 topological metals in the paramagnetic state. Both compounds exhibit high mobility, multiband transport and present an interesting platform for controlling the interplay between magnetic order associated with the R-site sublattice and nontrivial band topology associated with the V-based kagome network. Our results invite future exploration of other RV6Sn6 (R = rare earth) variants where this interplay can be tuned via R-site substitution.

【 授权许可】

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