Fig. 1: Structural and transport properties of the bilayer vanadium-based kagome compounds. | Nature Communications

Fig. 1: Structural and transport properties of the bilayer vanadium-based kagome compounds.

From: A new class of bilayer kagome lattice compounds with Dirac nodal lines and pressure-induced superconductivity

Fig. 1

a Top view of (top) the V3Sb kagome nets in single-layer compounds AV3Sb5 (A = K, Rb, Cs), (bottom) (V3Sb)2 bilayers in AV6Sb6 (A = K, Rb, Cs) and V6Sb4. The different offsets of the two adjacent V3Sb layers lower the rotational symmetry from sixfold to threefold. b Sketches of the structural unit cells of (left) AV3Sb5, (middle) AV6Sb6, (right) V6Sb4. The structures of all three series can be described as alternate stacking of the kagome unit (V3Sb)n and the spacing unit Am-1Sb2m. Single-crystal X-ray diffraction pattern for c the (00l) direction and d, e, the (hk0) plane measured in bilayer kagome compounds. f Temperature-dependent electrical resistivity of KV6Sb6 (orange), RbV6Sb6 (green, amplified by a factor of 2), CsV6Sb6 (blue), and V6Sb4 (red). Inset shows the Hall resistivity measured in CsV6Sb6 at T = 2 K. The solid dark blue curve is the linear fit corresponding to an electron-type carrier density of ne = 2.1 × 1021 cm−3.

Back to article page