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DOE OSTI2020

Materials Data on V3Sb2 by Materials Project

V3Sb2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. V2+ is bonded to five Sb3- atoms to form a mixture of distorted edge, face, and corner-sharing VSb5 trigonal bipyramids. There are a spread of V–Sb bond distances ranging from 2.76–2.85 Å. There are two inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded in a distorted q6 geometry to nine equivalent V2+ atoms. In the second Sb3- site, Sb3- is bonded in a 6-coordinate geometry to six equivalent V2+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on V3Sb2(PO4)6 by Materials Project

V3Sb2(PO4)6 crystallizes in the trigonal R3 space group. The structure is three-dimensional. there are three inequivalent V4+ sites. In the first V4+ site, V4+ is bonded to six O2- atoms to form VO6 octahedra that share corners with six PO4 tetrahedra. There is three shorter (1.90 Å) and three longer (1.93 Å) V–O bond length. In the second V4+ site, V4+ is bonded to six O2- atoms to form VO6 octahedra that share corners with six PO4 tetrahedra. There is three shorter (1.92 Å) and three longer (1.99 Å) V–O bond length. In the third V4+ site, V4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (1.82 Å) and three longer (2.36 Å) V–O bond lengths. There are two inequivalent Sb3+ sites. In the first Sb3+ site, Sb3+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All Sb–O bond lengths are 2.01 Å. In the second Sb3+ site, Sb3+ is bonded in a 3-coordinate geometry to three equivalent O2- atoms. All Sb–O bond lengths are 2.11 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two VO6 octahedra. The corner-sharing octahedra tilt angles range from 33–41°. There are a spread of P–O bond distances ranging from 1.49–1.61 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two VO6 octahedra. The corner-sharing octahedra tilt angles range from 25–30°. There are a spread of P–O bond distances ranging from 1.52–1.59 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one V4+ and one P5+ atom. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to one V4+ and one P5+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to one V4+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one V4+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sb3+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to one V4+, one Sb3+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a bent 150 degrees geometry to one V4+ and one P5+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2022

A density-wave-like transition in the polycrystalline V 3 Sb 2 sample with bilayer kagome lattice

Recently, transition-metal-based kagome metals have aroused much research interest as a novel platform to explore exotic topological quantum phenomena. Here we report on the synthesis, structure, and physical properties of a bilayer kagome lattice compound V 3 Sb 2 . The polycrystalline V 3 Sb 2 samples were synthesized by conventional solid-state-reaction method in a sealed quartz tube at temperatures below 850 °C. Measurements of magnetic susceptibility and resistivity revealed consistently a density-wave-like transition at T dw ≈ 160 K with a large thermal hysteresis, even though some sample-dependent behaviors were observed presumably due to the different preparation conditions. Upon cooling through T dw , no strong anomaly in lattice parameters and no indication of symmetry lowering were detected in powder x-ray diffraction measurements. This transition can be suppressed completely by applying hydrostatic pressures of about 1.8 GPa, around which no sign of superconductivity was observed down to 1.5 K. Specific-heat measurements revealed a relatively large Sommerfeld coefficient γ = 18.5 mJ∙mol –1 ∙K –2 , confirming the metallic ground state with moderate electronic correlations. Density functional theory calculations indicate that V 3 Sb 2 shows a non-trivial topological crystalline property. Furthermore, our study makes V 3 Sb 2 a new candidate of metallic kagome compound to study the interplay between density-wave-order, nontrivial band topology, and possible superconductivity.

36 MATERIALS SCIENCE↗